Mass Killers Often Rely on Past Perpetrators’ Blueprints

Experts have come to understand mass shootings less as isolated expressions of rage and more as acts that build on the outlines of previous rampages.

http://www.msn.com/en-us/news/us/mass-killers-often-rely-on-past-perpetrators’-blueprints/ar-AAfcRBn?ocid=spartandhp