3. They don't want to cross a line that can lead down a slippery slope
There are plenty of soldiers who have killed people and don't go down this slippery slope you speak of. Part of being a hero (or any type of leader) is being able to make the tough decisions and having people trust you to do it. If you're afraid you're on the verge of going crazy, you probably shouldn't be pretending to be a hero. The slippery slope argument is a weak excuse for characters who can't control themselves. Captain America is a perfect example, kill during a war, and still be a great leader after.
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