I was talking to a friend in ventrilo the other day about that scene. We both watched it and I don't know, I don't condone stuff like that, but when I saw the guy crawling along wounded, trying to get away, and then he got shot dead, I let out a little giggle. My friend said it made him sick and he wasn't sure if he wanted that game anymore.
The thing is, no matter how close to reality it is, no matter how realistic it looks, not matter how much it mirrors horrors that have happened in real life, I never really feel like that's a real person being shot. I look up photos and videos of real people being killed in various ways all the time, and I never giggle, I never laugh. I just can't get myself to that point with a video game, and knowing it's not real completely removes from me anything resembling sorrow or empathy. Maybe if it was a recreation of a real event like 9/11 it would hit a nerve with me, but even then I think they'd have to use the names or likenesses of real victims (which would never happen) for me to really feel that connection.
At the end of the day, no matter how horrible, repulsive, offensive, whatever, I can't forget that it's just a video game. I can try, but it doesn't work. I can even be invested in the characters and their well being, but it's still in the sense that these are the friends of my fake video game character.