Video Games and TV Teach to Kill

I just read an article here:
http://www.media-awareness.ca/english/resources/educational/handouts/video_games/teach_to_kill.cfm

And I disagreed with the fact that the Grossman dude says that TVs and video games teach kids to think bad about the world because if kids play or watch thiese stuff they would only think that the bad things only exist in their TVs and their video games.

I agreed that military warfare games are harmful to kids because in wars, you MUST kill for survival and I agree that video games teach kids about media violence and cigarette smoking, this is connected to the animated movie Lucky Luke because he smokes and shoot criminals, and I agree that the companies producing these stuff should be responsible for teaching kids to kill.

Video Game Question - Should twelve year-olds play whatever they want?

I think that twelve year-olds need the approval of their parents before they play or buy any video games, because some games may contain inappropriate contents. So if they wanna play, their parents should be watching them while they play it.