sorry I don't understand your reasoning. MOS Superman never thought he'd have to kill a person, just like most people. It was SHOWN repeatedly in the film that he really cared about people and did everything to save them. He didn't have to TELL us his inner feelings all the time because we could see it. I could see it. To me you're just trying too hard to dismiss his actions.
I never want to hear Superman saying that he can't kill. In his line of work, there is always the possibility. I want him to show that he truly cares and does all he can to preserve innocent lives. That's all.