I think that parents should be more responsible with what they let their kids play.
8 year olds should not be playing violent games, because they're still at an age where they find it difficult to distinguish fantasy from reality.
I know for a fact that GTA:SA has an effect on the mind. After playing it, I have an urge to ram random cars if I have to go anywhere during the day.
Bloody good thing I'm never getting a driver's license.
My sister has the same issue. Not that we'd actually do it, but the urge is there.