Personally (and I'm SO going to be attacked for saying this...) I feel that you should be allowed to have As Much Realism As Possible in games.
That's right, I think you should be able to do anything you like in games - with all the wonder and horror that comes with it.
Because personally I like to play a game as if I'm me.
And then I like to play as if I'm the polar opposite as me.
And sometimes I like to blow off steam and snipe people and go on a rampage etc.
And sometimes I like to play like a saint (for example I sometimes load up various GTA games and see how far through I can get by driving perfectly killing almost no-one and making money with taxi missions etc, just for a change you know?)
I have no problem with murdering, raping, curb stomping etc etc anyone in a game because games are ways to 'experience' thing you don't in real life.
In games you already do things you wouldn't normally do and killing swathes of adults in a game is in no way any more or less acceptable than say raping a child in a game. It's just something different to experience in the game that wouldn't happen in life - as is the point in games.
I have a feeling that the people who have problems with the morals of the situation get very immersed and almost see the game as real.
I don't get so immersed with a game that I don't remember it's just a game, so I have no problem with anything in games or literature (e.g. lolita).
Now if a game was like a holosuite then I probably would have moral issues, but the fact that you have a thing in your hands and you're controlling actions on a screen already stops full immersion.
Hope that's added something to the discussion