I actually have Modern warfare 2 having been a fan of the Call of Duty series since it started and yes, the airport scene is strong but its an 18 rated game.
Computer games are just the latest scapegoat used by people whodon't want to take responsibility for their actions, before games it was films and before films it was heavy metal (anyone remember the furore in America about backwards subliminal messaging?).
I agree thatthere are vulnerable people who shouldn't play these games but what about the average person? FPS games haven't made me go off on a killing spree, the Need for Speed series didn't turn me into a street racer, Assassins Creed & Hitman haven't turned me into a hired killer and Dragon Age Origins hasn't made me buy a sword & hack up anyone .
Blaming computer games is a simplistic argument that removes responsibility for actions. Look at the rise of feral youths and the kids they will have where proper parenting is replaced by a TV and/or games console, how are they supposed to learn the kinds of values we grew up with? I have seen parents buy this for their kids because they are too young to get it themselves. Games have an age rating for a reason just as films do, buying something like MW2 for a 9 or 10 year old to keep them quiet is a far more damning indictment of society than violent content in the game itself.