"CBS News analyzed a database compiled by The Violence Project. The nonprofit tracks mass shootings, which it defines as four or more people murdered in one event, not including the offender. It shows out of 195 mass shootings since 1966, 50 involved suspects who were veterans or people with military training.
"To be clear, only a tiny fraction of people with military backgrounds become mass shooters. But military experience is something a disproportionate share of attackers have in common. "People with a military background are overrepresented as mass shooters in our data," said James Densley, co-founder of The Violence Project. "It bears saying that the vast majority of people who serve in the military go on to lead incredibly successful lives, and obviously, we're incredibly grateful for that service. And so, this is not a case that joining the military turns you into a mass shooter."
"Densley said the breakdown is important to consider as researchers continue to search for clues about how and why these mass shootings happen.
A CBS News analysis of the data shows 26% of mass shooters over six decades have had military service or training. That is high compared to the general U.S. adult population, where 7%, or fewer than 1 in 10, has a military background, according to the U.S. Census Bureau. . . . . ."
https://www.cbsnews.com/news/maine-shooting-military-background-experts-explain-connection/