Today they don't drop nearly as many anvils on people's heads as they used to. Having watched those cartoons hasn't once made me want to drop an anvil on anyone's head. Well, sometimes I may have wanted to, but I never actually did it. Even as a kid I knew the difference between real life and TV violence. Unfortunately, a few people can't tell that difference.
Some people listen to gangsta rap and believe it's cool to be a criminal.
Some people see a movie about witches and demons and think those are neat things to emulate. Heavy metal music about suicide sends a few unstable kids over the edge. There's probably a few psychos out there who read a story about a serial killer and decide that's what they want to be. We can't help that. Those people will always find something to feed their aberrations.