I thought Batman doesn't kill people, either. I just watched 'Batman Beyond' and he freaked out and gave up being Batman because he almost shot a guy who was trying to kill him.
Your right. In one SM/BM cross-over comic, Batman convinces SM not to kill someone who claims that killing him is the only way to save Lois Lane from dieing. Fortunantly it was a lie, and Lois was saved another way. It still was one of the road-blocks in their relationship, that Clark chose sticking to his principals over saving Lois.
