I didn't say you should try to reduce it to a math problem. It's just that you need information before you can make choices.

And I think "there's some kind of fuzzy threshold where you should stop assisting someone" is a much better plan than "never assist anyone" or "always assist anyone, even hitler".

(If you think that's a strawman, you need to explain how the way you do things doesn't fit any of those three options.)

(And I'm not talking about hurting someone, or depriving them of basic human rights. Just not going out of my way to help them do what they want.)