Some people do, sure. I don’t think most people think about it hard enough to consider that they’d be looked down upon for not helping. They do because they’re capable and because they’re present, often without thought. Your world view is jaded, which is understandable. But I do not agree with it.
On the surface, your assertion seems to imply that you think you’re better than the majority of people because you do things “because you’re capable” and that others only do the same menial tasks because they’d be looked down on if they didn’t. That’s a dangerously self-centric way to look at things. I don’t think that’s really what you intended to imply, but… It’s there.
EDIT: Please don’t misinterpret, I’m not accusing you of thinking you’re better, just stating that that’s a possible interpretation of what you said and asking if you knew. I appreciate the candid discussion!