Las Vegas shooting David Becker/Stringer

Inside the Mind of the Mass Shooter

Many details about Stephen Paddock’s reasons for opening fire on a Las Vegas concert last weekend have yet to be discerned. But so-called “lone wolf” mass shooters are not a new phenomenon, and past episodes can offer important clues about the thought processes and experiences that motivate them.

LONDON – This weekend, Stephen Paddock opened fire on a country music festival in Las Vegas, Nevada, from an overlooking hotel, killing at least 59 people and injuring more than 500 others. Paddock, a 64-year-old former accountant with no criminal record, was ultimately found in his hotel room, dead, with some 23 guns, including more than ten assault weapons. Police later found an additional 19 firearms, explosives, and several thousands of rounds of ammunition in Paddock’s home. What the authorities have not yet found, however, is a motive.

More details about Paddock’s mindset and objectives will probably come to light in the coming days. But so-called “lone wolf” mass shooters – individual perpetrators with no ties to any movement or ideology – are not a new phenomenon, and these episodes have offered important clues about the motivations and thought processes of mass shooters.

Most mass shooters do not survive their own attacks; they either kill themselves or let police do the job. But those who have survived have shown some common features, with narcissistic personality disorder and paranoid schizophrenia being the two most frequent diagnoses. That was the case with Anders Breivik, the Norwegian far-right terrorist who, in 2011, detonated a van bomb that killed eight people, before shooting dead 69 participants in a youth summer camp. He remains in prison in Norway.

A look at behavior prior to attacks reinforces this view. In The Wiley Handbook of the Psychology of Mass Shootings, Grant Duwe, the director of research and evaluation for the Minnesota Department of Corrections, examined 160 cases of mass shootings in the United States between 1915 and 2013.

Duwe found that 60% of the perpetrators had either been diagnosed with a psychiatric disorder or exhibited signs of serious mental disturbance before the attack. About one third had contact with mental-health professionals, who had diagnosed them, most commonly, with paranoid schizophrenia. The second most common diagnosis was depression.

Yet, given that most people who suffer from these disorders are harmless to the public, these diagnoses do not tell the whole story. According to Duwe, the difference may lie partly in an acute sense of being persecuted – and an acute desire for revenge.

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This view is corroborated by Paul Mullen, an Australian forensic psychiatrist. Based on a detailed investigation of five mass murderers whom he personally examined, Mullen concluded that such killers struggle to reconcile their own grandiose ideas of themselves with an inability to succeed at work or in relationships. The only explanation, they decide, is that others are out to sabotage them.

In fact, Mullen’s study revealed that the path to mass murder is rather stereotypical. All of Mullen’s subjects had been bullied or socially excluded as children. They were all suspicious and rigid, qualities that helped to deepen their isolation. They constantly blamed their problems on others, believing that their community had rejected them; they failed to consider that they themselves were too wearisome or self-centered.

Mullen’s subjects obsessively held grudges against anyone whom they viewed as part of the group or community that refused to accept them. They ruminated relentlessly over past humiliations, a habit that fueled resentment and, eventually, revenge fantasies, leading them to use mass murder to achieve infamy and to hurt those perceived to have hurt them – even if it meant a “welcome death” for themselves.

Given this, there is usually a kind of warped logic to mass shooters’ choice of victims. In the case of school shootings, such as the Columbine High School massacre of 1999, that logic is clear: to punish those who have excluded the perpetrators socially. Likewise, workplace rampages are often triggered by a firing or layoff. But even in cases where the targets seem random, the logic usually emerges eventually, even if it is a matter of punishing an entire community or society.

In Paddock’s case, many questions obviously remain unanswered, beginning with why he chose that particular concert to attack. But the contours of his story are beginning to emerge. Reinforcing the loner trope, one neighbor said that the “weird” Paddock “kept to himself”; living next to him was “like living next to nothing.” It has also been revealed that in 2012, Paddock filed a negligence lawsuit against a Las Vegas hotel where he had fallen; litigiousness can be a hallmark of the resentful and paranoid.

Duwe argues that, contrary to popular belief, such gunmen do not “just snap.” Though roughly two-thirds of mass public shooters experience a traumatic event immediately before carrying out the attack – usually the loss of a job or relationship – most spend weeks or even years deliberating and preparing to get their revenge. In Paddock’s case, such quiet planning may explain the armory found in his home and hotel room, which he rented several days prior to the attack.

After the massacre, more than half of mass public shooters either commit suicide directly or provoke the police into killing them. This rate is nearly ten times higher than for homicide offenders in general. Does this reveal, Duwe asks, just how mentally plagued these perpetrators are? Perhaps they believe they can no longer bear the agony of life; once they have “settled the score” for the perceived slights that have produced it, there is no reason left to live.

Mullen argues that the script for this particular type of suicide has become entrenched in modern culture, and continues to attract willing lead actors. If we are unable to use the knowledge we have gleaned from past experience to prevent them from taking the stage, they will continue to take aim at audiences.

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