People claiming that video games cause violence are just giving a knee-jerk reaction while ignoring all of the actual evidence to the contrary. It especially amuses me that violent crime has been going down since the early 80s -- right around the time video games started being big.

It is yet another instance where I commonly want to hit people over the head with a heavy sign which says "CORRELATION DOES NOT EQUAL CAUSATION" in big letters. It is much, much more plausible that violent people are a type of people likely to want to play violent video games than the latter somehow being the sole (or even significant) cause of the violent behavior.