Mass killings, described by the FBI as four or more unlawful killings in a single event, devastate communities and create fear across countries. But if we’re going to begin to understand what makes someone randomly kill large numbers of people, it’s important to distinguish between the evidence and the mythology.

This film, featuring the work of Professor Craig Jackson, exposes three major myths: that random mass killings are a relatively recent phenomenon; that all mass killers are insane; and that mass killing is a form of "suicide by cop".