Video games and shootings...
To paraphrase Penny Arcade, it is a strange sort of patriot who world sacrifice the First Amendment to save the Second.
As a lifelong gamer and shooter (I started both around five years old) and having never been in so much as a fist fight, I firmly reject the notion that guns, video games, rock music, comic books, gay people, reality TV, rap music, sexual promiscuity or any number of other factors are to blame for violence.
It's a combination, to me, of a severe downfall in parenting skills and the deeply ingrained stigmatization of seeking mental help, which should be as easy and normal as getting cold medicine.
And even if all that, on a historical scale violence is down! A LOT!
My two cents.