I agree that the game is sick. I wouldn't want my kids to play it just because its disgusting and stupid (from what I hear anyway), to top it all off it is a 18+ game, however, I wouldn't ban the kids from playing the game because I think they will end up killing someone. I don't see how a normal 17 year old boy would be affected by a game.
I don't think that gaming related deaths actually happen. If there is a strong link between gaming and deaths I think we would have had an epidemic of child psychos.