Well that's a sweeping generalization Von Helmet. I am a young guy and I have been playing very violent video games, watching violent movies, watching violent TV and playing violent games since I was a child.
I'm also a completely normal, functioning person. It's up to parents, not the government to tell kids what they can and can't play with. If any parent can't recognize mental problems in their own child, then they aren't fit to be a parent.
We don't have seperate sections for violent movies at the video store, violent books at the library or a "violent music" section at the music store. It's up to parents to talk to their kids and find out if violence is effecting their minds.