‘People,’ so they proclaim, ‘originally praised unegoistic actions and called them good from the perspective of those for whom they were done, that is, those for whom the actions were useful. Later people forgot how this praise began, and because unegoistic actions had, according to custom, always been praised as good, people then simply felt them as good, as if they were something inherently good.’

- The Genealogy of Morals
A Polemical Tract
Friedrich Nietzsche

Many people dislike Nietzsche, but he makes logical sense.