Hehe. I think I would kill the robber for the sake of my life. In the case of the girl you mentioned, I can't say anything because I don't know her and I can't guess from one sided story but I agree with you that we don't know what we will encounter tomorrow as it's uncertain.
The moral of the story that I was trying to pass is that we shouldn't say we can never do something or even judge people we see doing that thing, because we don't know the conditions they were faced with.