Not really, killing the forces of evil within the confines of a virtual world is more than enough for me.
However, if I had to kill, I'm not sure that I could. I would require sufficient motivation (e.g. My families lives endangered or one of them killed before me).
Although this is merely speculation, it is one thing to say you could or couldn't do something, but is another to be faced with the situation. Maybe I'm going off topic a little, but it's still a little bit intriguing.