I'm on the other side of the fence saying that the video game industry NEEDS to be responsible for what they show to kids.
Because of this there are few rating sistems in place, so when parents or anyone wants to by the game they have indication of what's in it.
It's no different than placing a real gun in a kid's hands
I must say I don't agree with this. There is nothing close to real thing like a real life weapon in video game. They only look relistic to the eye. They don't act in any way similar to the real thing.