A new study indicates that watching violence on television as a child can promote agressive behavior, even 15 to 20 years later. This is another study whose results are pure bunk. Simply watching violent tv does not account for agressive behavior. Take me for example! ;) I watched all kinds of shoot-em-up movies when I was a kid, but I managed to turn into an (arguably) normal non-violent adult.
All these studies must exist to once again relieve the responsibility of ourselves and our parents and extend the blame for a poor upbringing on the rest of society.