Yeah, it is a concern. But what can be done? Bugger all. I think violent games should continue to be made, and for that game to continue its sale. This kid was obviously mentally not completely there, as I would think of anyone who got so influenced by a video game in such a way as to kill someone. Psychos still roam this earth, and always will, it's them that take video games too seriously. It's them that have nearly got wrestling banned because they attempted to copy a dangerous move at home. So what do you do? Do you ban violent games and watch billions of dollars go down the drain, watch game programmers lose their jobs and watch companies such as Capcom (who now puts all it's efforts into Resident Evil) go bankrupt? Or ...
Do you let violent games continue? I go with the latter - billions shouldn't be lost just because of one psycho. There are warnings all over that game saying it's violent - this whole incident is a fault on the behalf of the parents (who obviously bought this game for their child) and the kid.