Who lives, who dies, who decides: Differences between mass public shooters who survive, are killed, and commit suicide

Abstract

This study provides an in-depth analysis of American mass public shooting conclusions between 1966 and 2017. Specifically, this work examines differences in factors contributing to the perpetrator's likelihood of surviving, being killed, and committing suicide. Ten hypotheses, rooted in previous homicide, suicide, homicide-suicide, and mass public shooting literature consider different psychological, situational, and background factors shaping the outcome of mass public shootings. Significant findings indicate factors influencing perpetrators' suicide include suicidal ideation, higher victim counts, and suicide copycat effects. Factors influencing perpetrators being killed similarly include higher victim counts, the arrival of law enforcement, lethal/non-lethal resistance, and government targets. This investigation provides practical implications for practitioners and policymakers, especially law enforcement and mental health practitioners, seeking to develop intervention and prevention strategies for addressing suicidal ideation and its most lethal outcome: mass public shootings.