I do agree that the video games can put ideas into anyones head, no matter what age they are. But the video game does not make them act on that idea, its there choice. The video game may have put an idea in the guys head, but no matter how violent or disgusting the game maybe, it did not force the guy to commit murder.
So I dont think its right for them to balme the game for him commiting murder, it can only really be blamed for the idea, if that.
I reckon that the game shouldn't be sold to people under age. I dont think they could stop them selling it to people 18 years and over...not sure.
I think he's old enough to take responsibility for his own actions and the parents have to realise in blaming the video game, there just sending the message that, if you kill someone, you can blame it on something, and let that take the wrap for your actions.

Off topic - please dont call teenagers in general morons, its actually degrading to us when we havent done anything. Try and be more specific about which teenagers are morons, like that guy. Otherwise, calling the whole teenage population morons is like i said degrading.