Are most "normal" people ethical or empathetic only when they can gain social capital from being publicly seen as acting in such a way?
I've frequently heard that "normal" people only act fairly or with empathy in order to perform that behavior for others. A person who does these in private rather than optimizing for self-interest, even when they could not possibly gain social standing by sacrificing potential gains, is exhibiting a symptom of autism or some other behavioral disorder.
Is this true? How widespread is this behavior such that is considered "normal"? Could you even experimentally test for this or evaluate how common it is?