The profile of a mass killer according to the USA Today:
According to one study by James Knoll and Ronald Pies in the medical trade publication Psychiatric Times, mass killers are typically angry, aggrieved, emotionally unstable people who seek retribution or revenge for perceived mistreatment, rejection or humiliation. Offenders are often socially isolated and have limited social support.
“The ones who are more apt to commit mass murder are the ones who are paranoid, and who are suspicious and mistrusting and think that everyone is against them,” said Michael Stone, a forensic psychiatrist at Columbia University who maintains a database of 350 mass killers going back more than a century. “It’s somebody who has fewer capacities at his disposal for adjusting to the crisis of losing the job or the girlfriend and will feel that life is over.”
Four in 10 men report that they own a gun. Gun owners are also predominantly white. According to Stone, men tend to be more aggressive and are more prone to violence. Offenders who commit public mass killings tend to be younger. At the same time, most family homicides involve middle-aged men.
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