So what about when we don't know how to value the life in question, you just know that it's a person who will stay alive if you chose, or die if you take $x - I

So what about when we don't know how to value the life in question, you just know that it's a person who will stay alive if you chose, or die if you take $x - I don't know what my own decision would be, yet alone an average decision. It's one of those odd situations that I think gets a different answer depending on what responsibility you feel. If the entirety of my wealth is $2.5m I don't think I would spend it to save the life of somebody I don't know. But would I go out and murder someone for that money? I don't think so.. and hope not. Both of the same are, I think, true for $100k.