Is there any proof, and I mean scientifically, double-blind, controlled proof, that violent video games leds to physical real world violence?
What about television? Lot's of violence there too.
What about if you live in the 'hood? Lot's of violence there also.
If you and I get into a fight and you hit me can I sue a FPS game company because you play one of their games?
Instead of going after the company (which has probably very little impact on the kids but lots of money) people should be looking at the parents (who should have lots of impact on the kids but have very little money).
When parents stop letting television and computer games raise their kids then the kids will probably behave quite a bit better.