I want to disprove the important assumption that people act in their own self-interest. Imagine that I can demonstrate cases where people act altruistically or for the benefit of others rather than...

I want to disprove the important assumption that people act in their own self-interest. Imagine that I can demonstrate cases where people act altruistically or for the benefit of others rather than their own self-interest. The rational choice theorist argues that either (1) the action really benefits the individual’s self-interest (e.g., helping others makes them feel good) or (2) the person is irrational and therefore outside the boundary conditions of the theory. Can this assumption be disproved or is it tautologically true?