Indeed, scientists have been studying animal abuse as a predictor of future mass violence since the 1960s. A 2013 study, coauthored by Northeastern University professor Arnold Arluke, found that about 40 percent of school shooters from 1988 to 2012 committed a particular type of abuse: flagrant, “up-close and personal” violence against animals, like “strangling, bludgeoning, burning, or mutilating” […]