Just kidding - great examples.
I was thinking in terms of war correspondents. Some have walked among friend and foe alike - taking photos. To take up arms, even to save a life, would at the very least, end one's ability to ever report both sides of a story again. To drag an injured soldier to safety - a difficult decision (well, I would do it, but then I'm not a war correspondent), perhaps less so if there were no other person present who could do it.
Think of contrast/comparison to Red Cross personnel and clergy in a war zone. They likewise are prevented from taking up arms, even to defend a life or lives. Some have crossed that line - and been celebrated for it. But they put at risk the 'neutrality' presumed among other members of their own coterie, possibly putting many more in danger in the long run.
Hmmm...