The four factors most mass shootings have in common
The National Institute of Justice has an impressive database covering every mass shooting since 1966, and every shooting incident at a school, workplace, or place of worship since 1999.
The LA Times reviewed this information, ultimately noting that nearly every incident was driven by a perpetrator with four qualities in common.
First, most shooters were exposed to trauma and/or violence at a young age; they were victims of bullying, their parents were abusive, or they witnessed acts of violence firsthand.
This often leads to depression, anxiety, suicidality, and other mental health conditions.
This trigger point usually leads to a visible change in behavior, sometimes including specific threats of violence.