Mass shootings in the United States

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See also: List of mass shootings in the United States
File:Total deaths in US mass shootings.png
Total deaths in U.S. mass shootings from 1982–2012, shaded to indicate the beginning and end of the Federal Assault Weapons Ban.[1]
File:2015 Mass Shootings (cropped).jpg
Locations of US mass shootings in 2015, according to Shooting Tracker.

Mass shootings are incidents involving multiple victims of firearm-related violence. The precise inclusion criteria are disputed, and there is no broadly accepted definition.[2][3][4] One definition is an act of public firearm violence—excluding gang killings, domestic violence, or terrorist acts sponsored by an organization—in which a shooter kills at least four victims. Using this definition, one study found that nearly one-third of the world's public mass shootings between 1966 and 2012 (90 of 292 incidents) occurred in the United States.[5][6] Using a similar definition, The Washington Post records 163 mass shootings in the United States between 1967 and June 2019.[7]

Gun Violence Archive, frequently cited by the press, defines a mass shooting as firearm violence resulting in at least four people being shot at roughly the same time and location, excluding the perpetrator.[8][9] Using this definition, there have been 2,128 mass shootings since 2013, roughly one per day.[8][10]

The United States has had more mass shootings than any other country.[11][5][12][13][14][15] Shooters generally either die by suicide afterward or are restrained or killed by law enforcement officers or civilians.[16] Mass shootings accounted for under 0.2% of homicides in the U.S. between 2000 and 2016.[17]

Definitions

There is no fixed definition of a mass shooting in the United States.[4][18] The Investigative Assistance for Violent Crimes Act of 2012, signed into law in January 2013, defines a mass killing as one resulting in at least three victims, excluding the perpetrator.[19][4][20][21] In 2015, the Congressional Research Service (CRS), while not defining a mass shooting, does define a public mass shooting—for the purposes of its report entitled "Mass Murder with Firearms"—as "a multiple homicide incident in which four or more victims are murdered with firearms, within one event, and in one or more locations in close proximity". The CRS further states that its report "attempts to refine the relatively broad concept of mass shooting... into a narrower formulation: public mass shootings."[22] A broader definition, as used by the Gun Violence Archive, is that of "four or more shot or killed, not including the shooter".[23] The latter definition is often used by the media, press, and non-profit organizations.[24][25][26][27][28][29]

Frequency

File:Lasvegassignflowers.jpg
Memorial at the Welcome to Fabulous Las Vegas sign following the 2017 Las Vegas shooting, which resulted in 60 people being killed and 411 non-fatal injuries.[30][31][32]

Some studies indicate that the rate at which public mass shootings occur has tripled since 2011. Between 1982 and 2011, a mass shooting occurred roughly once every 200 days. However, between 2011 and 2014, that rate has accelerated greatly with at least one mass shooting occurring every 64 days in the United States.[33]

In recent years, the number of public mass shootings has increased substantially, although there has been an approximately 50% decrease in firearm homicides in the nation overall since 1993. The decrease in firearm homicides has been attributed to better policing, a better economy and environmental factors such as the removal of lead from gasoline.[34]

Differing sources

A comprehensive report by USA Today tracked all mass killings from 2006 through 2017 in which the perpetrator willfully killed 4 or more people. For mass killings by firearm for instance, it found 271 incidents with a total of 1,358 victims.[35] Mother Jones listed seven mass shootings, defined as indiscriminate rampages in public places resulting in four or more victims killed,[36] in the U.S. for 2015.[37] An analysis by Michael Bloomberg's gun violence prevention group, Everytown for Gun Safety, identified 110 mass shootings, defined as shootings in which at least four people were murdered with a firearm, between January 2009 and July 2014; at least 57% were related to domestic or family violence.[38][39]

Other media outlets have reported that hundreds of mass shootings take place in the United States in a single calendar year, citing a crowd-funded website known as Shooting Tracker which defines a mass shooting as having four or more people injured or killed.[27] In December 2015, The Washington Post reported that there had been 355 mass shootings in the United States so far that year.[40] In August 2015, The Washington Post reported that the United States was averaging one mass shooting per day.[41] An earlier report had indicated that in 2015 alone, there had been 294 mass shootings that killed or injured 1,464 people.[42] Shooting Tracker and Mass Shooting Tracker, the two sites that the media have been citing, have been criticized for using a broader criteria—counting four victims injured as a mass shooting—thus producing much higher figures.[43][44]

Mass shootings tend to occur in clusters. When one occurs another is likely to follow, according to research by the Violence Project.[45]

Demographics

According to The New York Times, almost all of the mass shooting perpetrators they have published stories about are male, most commonly white men.[46] However, according to most analyses and studies, the proportion of mass shooters in the United States who are white is slightly less than the overall proportion of white people in the general population of the US. The proportion of male mass shooters is considerably larger than the proportion of males in the general population.[47] According to the Associated Press, white men comprise nearly 50 percent of all mass shooters in the US.[48] According to the Center for Inquiry, mass shootings of family members (the most common) are usually carried out by White, middle-aged males. Felony mass shootings (connected with a previous crime) tend to be committed by young Black or Hispanic males with extensive criminal records, typically against persons of the same ethnic group. Public mass shootings of persons unrelated to the shooter, and for a reason not connected with a previous crime (the rarest but most publicized) are committed by men whose racial distribution closely matches that of the nation as a whole.[49][50] Other than gender, the demographic profiles of public mass shooters are too varied to draw firm conclusions.[49]

Contributing factors

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See also: Criticism of Facebook § Narcissism; Criticism of Facebook § Non-informing, knowledge-eroding medium; Digital media use and mental health § NPD; Facebook like button; Online youth radicalization; and Radicalization

Several possible factors may work together to create a fertile environment for mass murder in the United States.[51] Most commonly suggested include:

  1. Higher accessibility and ownership of guns.[5][14][51] The US has the highest per-capita gun ownership in the world with 120.5 firearms per 100 people; the second highest is Yemen with 52.8 firearms per 100 people.[51]
  2. Mental illness[52] and its treatment (or the lack thereof) with psychiatric drugs.[53] This is controversial.[54][55][56][57] Many of the mass shooters in the U.S. suffered from mental illness, but the estimated number of mental illness cases has not increased as significantly as the number of mass shootings.[5]
  3. The desire to seek revenge for a long history of being bullied at school and/or at the workplace. In recent years, citizens calling themselves "targeted individuals" have cited adult bullying campaigns as a reason for their deadly violence.[58]
  4. The widespread chronic gap between people's expectations for themselves and their actual achievement,[51] and individualistic culture.[59] Some analysts and commentators place the blame on contemporary capitalism and neoliberalism.[60][61]
  5. Desire for fame and notoriety.[51][5] Also, mass shooters learn from one another through "media contagion," that is, "the mass media coverage of them and the proliferation of social media sites that tend to glorify the shooters and downplay the victims."[62][63]
  6. The copycat phenomenon.[5]
  7. Failure of government background checks due to incomplete databases and/or staff shortages.[64][65]

A panel of mental health and law enforcement experts has estimated that roughly one-third of acts of mass violence—defined as crimes in which four or more people were killed—since the 1990s were committed by people with a "serious mental illness" (SMI). However, the study emphasized that people with an SMI are responsible for less than 4% of all the violent acts committed in the United States.[66]

Additionally, in February 2021, Psychological Medicine published a survey reviewing 14,785 publicly reported murders in English language news worldwide between 1900 and 2019 compiled in a database by psychiatrists at the New York State Psychiatric Institute and the Columbia University Irving Medical Center that found that of the 1,315 personal-cause mass murders (i.e. driven by personal motivations and not occurring within the context of war, state-sponsored or group-sponsored terrorism, gang activity, or organized crime) only 11 percent of mass murderers and only 8 percent of mass shooters had an SMI (e.g. schizophrenia, bipolar disorder, major depressive disorder), that mass shootings have become more common than other forms of mass murder since 1970 (with 73 percent occurring in the United States alone), and that mass shooters in the United States were more likely to have legal histories, to engage in recreational drug use or alcohol abuse, and to display non-psychotic psychiatric or neurologic symptoms.[67][68][69]

Survey coauthor psychiatrist Paul S. Appelbaum argued that the data from the survey indicated that "difficulty coping with life events seem more useful foci for prevention [of mass shootings] and policy than an emphasis on serious mental illness",[70] while psychiatrist Ronald W. Pies has suggested that psychopathology should be understood as a three-gradation continuum of mental, behavioral and emotional disturbance with most mass shooters falling into a middle category of "persistent emotional disturbance".[71] In 2014, the Federal Bureau of Investigation conducted a survey of 160 active shooter cases in 40 states and the District of Columbia between 2000 and 2013 (averaging approximately 11 cases annually) that found that 112 incidents (70%) took place in a business, commercial, or educational environment, 96 incidents (60%) ended before police arrived, in 64 incidents (40%) the shooter committed suicide and 64 also qualified as mass murder, while in only 6 incidents (4%) was the perpetrator female and in only 2 incidents (1%) was there more than one perpetrator.[72]

In 2015, psychiatrists James L. Knoll and George D. Annas noted that the tendency of most media attention following mass shootings on mental health leads to sociocultural factors being comparatively overlooked.[73] Instead, Knoll and Annas cite research by social psychologists Jean Twenge and W. Keith Campbell on narcissism and social rejection in the personal histories of mass shooters, as well as cognitive scientist Steven Pinker's suggestion in The Better Angels of Our Nature (2011) that further reductions in human violence may be dependent upon reducing human narcissism.[74][75]

Weapons used

Several types of guns have been used in mass shootings in the United States. A 2014 study conducted by Dr. James Fox of 142 shootings found that 88 (62%) were committed with handguns of all types; 68 (48%) with semi-automatic handguns, 20 (14%) with revolvers, 35 (25%) with semi-automatic rifles, and 19 (13%) with shotguns.[76][77] The study was conducted using the Mother Jones database of mass shootings from 1982 to 2018.[78] High capacity magazines were used in approximately half of mass shootings.[79] Semi-automatic rifles have been used in six of the ten deadliest mass shooting events.[80][81]

Effects

Political

A British Journal of Political Science study first published in 2017 (and in print in 2019) found that increase in proximity to mass public shootings in the U.S. was associated with statistically significant and "substantively meaningful" increases in support for stricter gun control laws.[82] The study also found that repeated events, magnitude, and recency of mass shootings play a role, with "proximity to repeated events, more horrific events and more recent events" increasing "the salience of gun violence, and thus ... support for gun control."[82] However, the study found that the "most powerful effects" in support or opposition to gun control "are driven by variables related to local culture, with pronounced but expected differences emerging between respondents in rural, conservative and gun-heavy areas and those residing in urban, liberal areas with few firearm stores."[82] A separate 2019 replication study, extending the earlier panel analysis, found no evidence that mass shootings caused a "significant or substantively meaningful main effect" on attitudes toward gun control.[83] However, the study did find evidence that mass shootings "have polarizing effects conditional on partisanship": "That is, Democrats who live near a mass shooting even tend to become more supportive of gun control restrictions, while Republican attitudes shift in the opposite direction."[83] The study authors concluded, "To the extent that mass shootings may affect public opinion, the result is polarizing rather than consensus building."[83]

A 2020 study published in the American Political Science Review using data on school shootings from 2006 to 2018 concluded the incidents had "little to no effect on electoral outcomes in the United States",[84] whereas a 2021 study in the same journal, covering a broader time period (1980–2016) found that the vote share of the Democratic Party increased by an average of almost 5 percentage points in counties that had experienced a "rampage-style" school shooting.[85] Both studies found no increase in voter turnout.[84][85]

A 2021 study published in PNAS concluded that "mass shootings have a strong impact on the emotions of individuals, but the impact is politicized, limited to individuals living within the town or city where the incident occurs, and fades within a week of the incident."[86] The study authors suggested that this phenomenon could help explain why mass shootings in the U.S. have not led to meaningful policy reform efforts.[86]

Public health

A review article first published online in 2015 and then printed in January 2017 in the journal Trauma, Violence, & Abuse, concluded that "mass shootings are associated with a variety of adverse psychological outcomes in survivors and members of affected communities" and that while "the psychological effects of mass shootings on indirectly exposed populations" is less well-understood, "there is evidence that such events lead to at least short-term increases in fears and declines in perceived safety."[87] Identified risk factors for adverse psychological outcomes have included, among others, demographics, greater proximity to the attack, acquaintance with victims, and less access to psychosocial resources.[87]

Deadliest mass shootings since 1949

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Main article: List of mass shootings in the United States

The following mass shootings are the deadliest to have occurred in modern U.S. history. Only incidents with ten or more fatalities, excluding those of the perpetrators, are included. This list starts in 1949, the year in which Howard Unruh committed his shooting, which was the first in modern U.S. history to incur ten or more fatalities.[88]

dagger Was previously the deadliest mass shooting
Incident Year Location Deaths Injuries Type of firearm(s) used Ref(s)
1 Las Vegas shooting 2017 Paradise, Nevada 60 (plus 1 perp.)[fn 1] 867 (411 from gunfire) Semi-automatic rifles (some outfitted with bump stocks), bolt-action rifle, and revolver [89][90][91]
2 Orlando nightclub shooting dagger 2016 Orlando, Florida 49 (plus 1 perp.) 58 (53 from gunfire) Semi-automatic rifle and pistol [89][90]
3 Virginia Tech shooting dagger 2007 Blacksburg, Virginia 32 (plus 1 perp.) 23 (17 from gunfire) Semi-automatic pistols [89]
4 Sandy Hook Elementary School shooting 2012 Newtown, Connecticut 27 (plus 1 perp.) 2 Semi-automatic rifle, bolt-action rifle, and pistol [89]
5 Sutherland Springs church shooting 2017 Sutherland Springs, Texas 26 (plus 1 perp.)[fn 2] 22 Semi-automatic rifle [90][92]
6 Luby's shooting dagger 1991 Killeen, Texas 23 (plus 1 perp.) 27 Semi-automatic pistols [89]
El Paso Walmart shooting 2019 El Paso, Texas 23[fn 3] 23 Semi-automatic rifle [93][94][95]
8 San Ysidro McDonald's massacre dagger 1984 San Diego, California 21 (plus 1 perp.) 19 Semi-automatic carbine, pistols, and shotgun [89]
9 University of Texas tower shooting dagger 1966 Austin, Texas 17 (plus 1 perp.)[fn 2][fn 4] 31 Bolt-action rifle, semi-automatic carbine, revolver, semi-automatic pistols, and pump-action shotgun [89]
Stoneman Douglas High School shooting 2018 Parkland, Florida 17 17 Semi-automatic rifle [96]
11 Edmond post office shooting 1986 Edmond, Oklahoma 14 (plus 1 perp.) 6 Semi-automatic pistols [89]
Fort Hood shooting 2009 Killeen, Texas 14[fn 2] 32 (plus 1 perp.) Semi-automatic pistol and revolver [97][98]
San Bernardino attack 2015 San Bernardino, California 14 (plus 2 perps.) 24 Semi-automatic rifles [89][90]
14 Camden shootings dagger 1949 Camden, New Jersey 13 3 Semi-automatic pistol [99][100]
Wilkes-Barre shootings 1982 Wilkes-Barre, Pennsylvania 13 1 Semi-automatic rifle [101][102][103]
Wah Mee massacre 1983 Seattle, Washington 13 1 Semi-automatic pistol(s) and/or revolver(s)[fn 5] [104]
Columbine High School massacre 1999 Columbine, Colorado 13 (plus 2 perps.) 24 (21 from gunfire) Semi-automatic carbine, semi-automatic pistol, and shotguns [105]
Binghamton shooting 2009 Binghamton, New York 13 (plus 1 perp.) 4 Semi-automatic pistols [106]
19 Aurora theater shooting 2012 Aurora, Colorado 12 70 (58 from gunfire) Semi-automatic rifle, pistol, and shotgun [107][90][108]
Washington Navy Yard shooting 2013 Washington, D.C. 12 (plus 1 perp.) 8 (3 from gunfire) Semi-automatic pistol and shotgun [109][110]
Thousand Oaks shooting 2018 Thousand Oaks, California 12 (plus 1 perp.)[fn 6] 16 (1 from gunfire) Semi-automatic pistol [111][112]
Virginia Beach shooting 2019 Virginia Beach, Virginia 12 (plus 1 perp.) 4 Semi-automatic pistols [113]
23 Easter Sunday Massacre 1975 Hamilton, Ohio 11 0 Semi-automatic pistols and revolver [114]
Pittsburgh synagogue shooting 2018 Pittsburgh, Pennsylvania 11 6 (plus 1 susp.) Semi-automatic rifle and pistols [115]
25 Palm Sunday massacre 1984 Brooklyn, New York 10 0 Semi-automatic pistols [116]
Geneva County shootings 2009 Geneva County, Alabama 10 (plus 1 perp.) 6 Semi-automatic rifles, revolver, and shotgun [117][118]
Santa Fe High School shooting 2018 Santa Fe, Texas 10 13 (plus 1 susp.) Shotgun and revolver [119]
Boulder shooting 2021 Boulder, Colorado 10 1 (plus 1 susp.)[fn 7] Semi-automatic pistols [120][121]
Buffalo shooting 2022 Buffalo, New York 10 3 Semi-automatic rifle and shotgun [122]

See also

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Notes

  1. ↑ including 2 victims who died due to complications in 2019 and 2020
  2. ↑ 2.0 2.1 2.2 The fatality total includes an unborn child.
  3. ↑ including 1 victim who died due to complications in 2020
  4. ↑ including 1 victim who died due to complications in 2001
  5. ↑ During the massacre, the perpetrators used three .22 caliber handguns of an unknown type that were never recovered by the authorities.
  6. ↑ One of the victims was killed by stray police gunfire
  7. ↑ The civilian injury was indirect

References

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External links

  • Lua error in package.lua at line 80: module 'strict' not found.
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