Munich gunman had book about Columbine and Virginia Tech killers

The Guardian

As German authorities try to determine what could have led an 18-year-old student to murder nine people at a shopping centre in Munich, one of the pieces of the puzzle they will be considering is a book called Why Kids Kill: Inside the Minds of School Shooters.

A copy of a German translation of the 2009 work, by the American academic Peter Langman, was found by police in the bedroom of the gunman, identified as Ali Sonbaly.

The book examines the factors that combine to turn young people into mass murderers. It classifies 10 school killers into three groups: psychopathic, psychotic, and traumatised.