Youth groups often participate in activities that promote harmony like volleyball, helping the poor and putting on church musicals. There's a lot of camaraderie between players. I've never seen tempers flair. Grossman points out that infantry training in World War II used bull's eye targets. Now human-shaped silhouettes that pop into their field of view are used.
Paint ball uses real people.
Ironically, Grossman teaches psychology at Arkansas State University in Jonesboro. That was where the largest school massacre in American history happened on March 24. Two boys, ages 11 and 13, are in jail and charged with the murder of four girls and a teacher. Ten others were injured. Humans don't kill naturally, Grossman contends.