I hate the stereotype that violent video games cause violent behavior. I think poor parenting and the lack of good values causes violent behavior. I have played violent video games (in particular) since the Super Nintendo and I am one of the most non-violent people you could ever meet.
The one thing that angers me the most, and let me emphasize MOST, is when someone goes and hijacks a car or/then kills somebody and says "I saw it on Grand Theft Auto". GTA is one of, if not my favorite games of all time!