Morality and military training are not the same. The question is about a switch and no repercussions for a reason. What if five armoire-sized people are beating on <whatever> and I'm a little girl? What if I know they are drunk and likely to kill me too? Do I still render assistance? Knowing I have no assistance to give, am not trained nor prepared and going to increase the body count to 2?

I am not trained in combat, and if I see a scrawny guy abusing another I might get in on it. If they are large I will not. Morality of the situation is the same, with different results.

Don't get me wrong, I have the utmost respect for people who risk personal harm to save others. Note the word "risk", by which I mean non-zero change of harm. When chances of harm/death reach close to 100%, it's no longer courage. I don't plan on dieing with someone for the heck of it nor do I expect anyone to jump in to keep me company.

The only reason people help is because they think they have a decent chance of making it out alive. After all, if someone is mugged and you pull out a gun and blow your brains all over them that'd likely end that robbery right there. The approach is unpopular.