This forum isn't big enough, lol. I am not discounting all of his arguments, but many are based upon correlative studies which really don't tell us anything. Selling more ice cream doesn't cause sharks to attack people, yet both see increases at the same time of year. I could make an incorrect correlation myself; ultra violent video games really started hitting the shelves in the mid 90s, right when juvenile crime rates began falling.
Needless to say, violence has been around long before video games. Kids often see increased aggression when another child enters the room, let alone when being subjected to violent behavior from video games, tv, comic books, novels or their own imagination. With 70 million killing trainers sold, we should see much more violence than we are seeing.