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The seven myths of mass murder

For the past 15 years my colleagues and I have conducted research on mass murder, the intentional killing of three or more individuals, excluding the perpetrator, during one event. Recent cases of mass murder have pointed to misconceptions about this rare and frightening act, and I would like to shed some light on what I consider the seven myths of mass murder.

Myth 1: They “snap”

Immediately following a mass murder, there is a steady stream of newspaper headlines and what I call “entertainment profilers” on television who proclaim that the individual “snapped.” There is no psychological term called snapping, but many assume that mass murder is done impulsively, with great emotion, and without planning or preparation. Almost all mass murders don’t fit this profile.

Research consistently shows that mass murderers research, plan, and prepare for their act of violence for days, weeks, and even months. The fantasy may have incubated in their minds for years, even though the time, place, and target had yet to be determined. The act usually occurs after a major loss in love or work, and this may “start the clock” wherein final detailed preparation begins. I have forensically evaluated a number of mass murderers in prison or forensic hospitals, and with few exceptions, there was no evidence of a high state of emotional arousal when the killings occurred. Witnesses who have survived mass murders invariably describe the shooter as cool, calm, and deliberate – a lack of emotion that is a corollary of planned violence.

Myth 2: They can easily be divided into “psychopaths, psychotics, and depressives”

Image Credit: ‘Sadness, Alone’, Image by geralt, CC0 Public Domain, via pixabay.

David Cullen, the journalist and author of Columbine, an excellent book on the high school mass murder in Colorado in 1999, has asserted this formulation. Unfortunately, his diagnostic classification of mass murderers is much too simplistic. Most are complex in their motivations and psychopathology. They often have both mental and personality disorders.

Mental disorders range from chronic psychotic disturbances, such as paranoid schizophrenia diagnosed in the Jared Loughner case, to major depression, bipolar, and other disorders. This may sound like splitting hairs, but when it comes to risk mitigation, fully understanding the range and complexity of these individuals’ disturbances is critical.

Personality disorders also abound in this group and are often a mixture of antisocial, paranoid, narcissistic, and schizoid traits – or in layperson’s terms, someone who habitually engages in criminal behavior, is suspicious of others’ actions, is self-centered and grandiose with little empathy, and is chronically indifferent toward others and detached from his emotional life. What Cullen has done is a disservice to the millions of individuals who are clinically depressed or have a psychotic disorder and pose no more risk of violence to others than your neighbor. Loughner has given paranoid schizophrenia a bad name – many other factors contributed to his attempted assassination and mass murder.

Myth 3: Incidents of mass murder are increasing


Image Credit: ‘Holster, Gun, Pistol, Flag’, Image by Ibropalic, CC0 Public Domain, via pixabay.

Myth 4: Banning assault weapons will lower the frequency of mass murder

The most popular weapon chosen by mass murderers in the US is a 9 mm pistol, often a Glock. Usually they bring two or three firearms to the scene, and assault weapons such as the AR 15 or AK 47 are generally not utilized. Therefore it should come as no surprise that between 1994 and 2004, when the federal assault weapons ban was in effect, there was no decrease in the average number of mass murders per year in the US. However, guns do kill people. As a gun owner myself, and a believer in the Second Amendment, I find it appalling that virtually anyone can purchase a firearm with little effort, money, or time in the US. I believe that firearms ownership is a right that should have requirements: demonstrable competency in its use and mental stability.

Myth 5: Psychotic individuals cannot plan in a precise and methodical manner

The majority of adult mass murderers are psychotic, meaning they have broken with consensual reality and perceive the world in an idiosyncratic and often paranoid way. Yet they may research the internet for weapons, practice video games to sharpen their marksmanship, purchase weapons and ammunition, conduct surveillance of the target, and carry out their mass murder, all from within a delusion.

A delusion is a fixed and false belief and may provide a rock-solid motivation for mass murderers. Paradoxically, delusions may help them commit irrevocably to paths of homicidal destruction. Our research has also found that mass murderers who are psychotic have higher casualty rates than those who are not. Typically they select victims who are complete strangers, who in their minds make up a “pseudocommunity” of persecutors bent on their destruction.

Myth 6: It must be the drugs they are abusing

It is true that most quotidian violence involves drug use, particularly alcohol. In cases of spousal homicide, the victim, perpetrator, or both are often intoxicated at the time. In mass murder, however, drug use is minimal, whether alcohol or other illicit substances.

Image Credit: ‘Drug, Health, Addiction, Stress’, Image by JeongGuHyeok, CC0 Public Domain, via pixabay.


Myth 7: Mass murder can be predicted and prevented


But there is another warning behavior that is quite frequent: mass murderers will leak their intent to others – a phrase expressed to another, or posted on the internet, that raises concern. It may be overt: “I’m going to kill my supervisor and his cohorts tomorrow;” or it may be covert: “don’t come to work tomorrow, but watch the news.” The logical reaction should be to alert someone in a position of authority; however, most people don’t. It surfaces after the event, with the rationale, “I just didn’t think he was serious.” Trust your emotional reactions of anxiety, wariness, or fear, and let law enforcement investigate.

Featured Image Credit: ‘Murder at Wollaton Park’, Photo by Duncan Harris, CC by 2.0, via flickr.

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