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While the motives for mass murder vary from perpetrator to perpetrator, since the Columbine school shooting in 1999, there has been a remarkable consistency—if not uniformity—in the age, gender, and race of the people who carry out these egregious crimes.
According to FBI arrest data, the peak ages for violent crime is 16–24. "This is a period of substantial transition in an individual's life, when they're less likely to have significant attachments in their life that deter them from criminal violence,"