When it's trash day on my block (city life) and the collectors leave a trash can in an open parking spot and I move that can to the sidewalk, you're claiming that I'm doing this because it makes me feel good to be helpful to someone I'll never encounter, and that this isn't "true altruism".

So, should we be discussing why we don't do things that make us feel bad? "True altruism" can't exist because we don't go around helping people commit murders or because we're not voting for a politician we dislike? I don't think that's the intent of the word.

I mean, there's 'doing things because they make you "feel good"' and there's altruism. These are not the same nor are they mutually exclusive.

I think perhaps the word you're trying to shoehorn into altruism is heroism - when you do something for the benefit of others knowing it's detrimental to yourself. Or, if you really want to dig into doing things that make you feel bad, I'm not really sure what word that would be. Idiocracy?