Book: Columbine shooters mentally ill, not bullied

In "Why Kids Kill: Inside the Minds of School Shooters," released by Palgrave Macmillan just before the 10th anniversary of the slayings in Littleton, Colo., Langman writes that most of the shooters were severely mentally ill, their defective personalities and disordered minds causing existential rage that found its expression in mass murder.