Columbine High School

Few people are as dangerous as an insecure man mocked

‘I have had more direct clinical experience than almost any other forensic psychiatrist of assessing and managing lone-actor perpetrators of massacres,’ writes Paul Mullen, professor emeritus at Monash University in Australia, in his introduction to Running Amok. He’s got non-clinical experience, too. In 1990, when he lived near Aramoana in New Zealand, he was disturbed by gunfire one night. It turned out that the neighbour of one of his patients was busy killing 13 people. Afterwards, Mullen supported the survivors and his patient, who felt ‘anguish’ at not spotting the red flags to prevent the massacre. Mullen summarises what she told him about the killer: His mood was marked by