Web Extra: What makes a person kill at a school?
10/02/2015 12:27 pm PDT
Phil Chalmers, an expert on the psychology of young killers, discusses the reasons and motivations of the people who act on their homicidal impulses at schools.
Phil Chalmers, an expert on the psychology of young killers, discusses the reasons and motivations of the people who act on their homicidal impulses at schools.
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