But the warning sign we must all memorize is this: The 19-year-old was abusive toward his ex-girlfriend and so taken with a girl that he essentially stalked her, according to students and teachers at Marjory Stoneman Douglas High School.
Mass shooting in the United States are carried out, overwhelmingly, by men with a history of domestic violence. Fifty-four percent of mass shootings in the United States involve a former or current partner or a family member being killed, according to Everytown for Gun Safety.
Domestic violence and gun violence are both public-health issues that must be taken far more seriously than they are. Our lives depend on it.