"Violence in movies is so much more pervasive and visceral than anything you could possibly see in a game, yet movie scenes are very rarely cited as the source of antisocial behavior."

Well, not anymore. You don't remember what the news coverage was like when The Matrix came out, do you? People were very concerned that a movie could be both so violent and so popular. That scene where Trinity and Neo take out an entire floor of security guards in slow-mo was replayed over and over.

But it's not news anymore. Eventually, news companies will lose interest in "violent videar-games on the intertubes" and move on.