There's no statistical evidence that confirms the negative effects of video game violence in society.
I can understand that certain people wouldn't like their young children exposed to certain images and ideas, if you're one of those people you should take responsibilty for what your child and what you want him to play.
The majority of people who've grown up playing violent video games have turned out pretty normal.... it's just the rare wanker that snaps and goes about emulating Doom...
Then again.... I've compeltely modled myself around 2d fighting games and pacman.... hmmmm..... maybe video games ARE bad for you ._.