I see no problems with it.
I don't think killing kids in real life is good.
The computer world is different.
But it does raise an interesting question of who is at fault if someone can't distinguish between the real world and a computer game.
I had an idea for a game at least a year ago - likely more - that was essentially going to allow one to do anything that they wanted in a fake world. The startup fees were too high and I amusingly enough couldn't get financial backing because they didn't feel that anyone had proven that it was done already or that there would be interest.
Now at least I'm seeing that it was idea that would have worked like I knew it would. Could have licensed Nike and Coke, etc - games are doing that now too. In game ad placement - buy clothes from stores in the game that allow you to wear current fashions, etc etc.
oh well.
Nobody ever raised the ethical questions the game might bring about when I talked to them about money - it was always people like my mom that raised the questions.