I agree. If 0.1% of the people that play violent video games committ violent crimes.
Rockstar sold over three million copies of GTA3. If GTA3 created violent people, why haven't there been at least ten thousand or so maniacal killers created?
Henry Jenkins wrote an interesting article, and he bases his conclusions on scientific analysis and not dramatic, colourful emotional responses of anecdotal evidence.
You can take a peek at his article, Eight Myths About Video Games Debunked, which at points refers to violence in video games.
In particular, I like the observation that over 90% of young boys play violent video games. Basically what this means is that if a young boy commits a violent act, there's a good chance that he's played a violent video game, so these activists will have no shortage of ammunition in their crusade.