In the wake of the Valentine’s Day shooting at a Broward County, Florida high school, a familiar trope has reemerged: Often, when a young man is the shooter, people try to blame the tragedy on violent video games and other forms of media. Florida lawmaker Jared Moskowitz made the connection the day after the shooting, saying the gunman “was prepared to pick off students like it’s a video game.”

In January, after two students were killed and many others wounded by a 15-year-old shooter in