Like I said, he's all of a sudden bringing out some moral code when it's relevant to HIM, and not the, oh I don't know, THE REST OF THE WORLD WHO WILL BE AFFECTED (at least I think I'm gathering this right. Again I haven't played it), but when he is unaffected by the death of someone, it's completely ok for him to kill them if he BELIEVES they are evil (very subjective term).
Selfish bastard.