Videogames get all the credit.

And Marilyn Manson.
Aren't those the things that we're trained to believe make kids today inherently violent? That train them to grab their guns, go to school and shoot the bullies? One would think. Or, at least they would if they're a Micheal Moore fan (Bowling for Columbine, anyone?). I am not. I have, however, seen all of his films. Each one (aside from his very first, which no one really remembers or seems to care about - "Roger and Me", check it out) just proves to me that a hypocritical, slightly idiotic American with a vendetta against "the Man" and a video-camera is actually The Worst Idea. Worse than taking a[n alcoholic] drink every time the word 'love' is said in Moulin Rouge (a 2.47 min song has the word 22 times). Micheal Moore, to me, represents most people - people who are taught and raised to point fingers, often in the wrong directions. These people are usually hypocritical. For example, Micheal Moore lives in Manhattan and sends his kid to an expensive private school. So much for helping "the little guy" in Flint, huh? As much as he argues against the system, he buys right into it.
So, back to my point, which, ironically, was one made by Mr. Moore himself.
If anyone is familar with the work of Cormac McCarthy they'll know that as much as he is a fantastic writer, his books are inherently violent and gory, albeit in a very poetic fashion. This, however, does not change the fact that they are probably more violent than any song by a metal artist or videogame created in Silicon Valley. Take Blood Meridian for example - 330 pages of nothing but scalping, shooting, stabbing, necrophelia, you name it. And it was a novel for my university level English class. Now, I know that when people talk about the effects of violence, they are mostly referring to the effects it has on children, but are not all people impressionable? Can't everyone be desensitized, brainwashed, and so on? The last time I checked, yes, they could. So, if at the same time critics are condemning the latest Grand Theft Auto for encouraging rape and violence, why do they not at the same time turn to the grear American authors and question their writing? Why are the minds of kids going into high school questioned and the effects of heavy metal music taken into account, but not literature? It's a double standard of our culture, it would seem. Aristotle's theory of catharsis can be used here - that we visualize violence in order to live out our own urges.
In the end I think that Cormac McCarthy had something right with Blood Meridian - I think that people, while not necessarily inherently violent, are fascinated by violence and the nature of some people to give in to that baser instinct. (Hasn't everyone fantasized about punching someone in the jaw at least once?). It's this fascination that causes people to both retain violent outlets, and point the finger.