It's not their fault--it's still under construction. This part's scary:
"What happens when a teen spends a lot of time playing violent videogames is the aggression center of brain activates but the emotional regulation center of brain deactivates," says teen brain specialist Walsh, who also directs the National Institute on Media and the Family. "Exactly the combination that we would not want to see."
"Aggression researcher Bruce Bartholow adds that hundreds of studies have shown that people who are exposed to media violence become more aggressive."