Self-interest is not a well defined concept. The notion of self is not somehow objective or immutable. Describing someone's self-interest is just another framew

Self-interest is not a well defined concept. The notion of self is not somehow objective or immutable. Describing someone's self-interest is just another framework for describing the same underlying system that morality and all that is trying to describe. There is a bit of circularity when one tries to make self-interest an essential feature of brains: https://en.wikipedia.org/wiki/Psychological_egoism#Circularity https://en.wikipedia.org/wiki/Psychological_egoism#Circulari... In cases like extreme nationalism, the zealot has essentialized the nation-state into their identity and is thus acting in their 'self-interest'. If one defines self-interest as interest in the health and reproduction of the body, then humans are emphatically not drive solely by self-interest.