I think kids eventually get fed up with first person shooters and crime games anyway and tend to look for more unusual and challenging games after a while some of the games out there are actually mildly educational like Age of Empires which includes brief histories of each of the civilisations and involves managing an economy,building farms,and innovating technologically in order to advance beyond your opponents there's still plenty of war though.
I've even played thief which was a thoroughly imaginative game where the character is essentially a good thief who sneaks around in the dark picking locks and blackjacking guards.I get fed up very easily of playing any computer game and so do kids mine have the usual playstation games etc. but they prefer being outside playing using their imaginations or riding the horses the last thing they can be bothered with is music because that's what daddy does"boring." and "oh no not the music shop."Look at pokemon it came and went in a matter of months same thing with these games it's a fad.