We need to navigate complicated philosophical questions in order to decide how to act, what to do, what behaviors to incentivize, what behaviors to punish, what signals to send, and even how to have a society at all. Sometimes we can use theories from science and mathematics to explicitly model how a system works and what we want from it. But even the scholars who understand these insights rarely know exactly how to objectively apply them in the real world. Yet anyone who lives with others needs to be able to do these things; not just scholars but ordinary people, children, and even chimpanzees. So sometimes we use heuristics and approximations. Evolution has given us some of them as instincts. Children learn others as practically-innate hyperpriors before they’re old enough to think about what they’re doing. And cultural evolution creates others alongside the institutions that encourage and enforce them. In the simplest case, we just feel some kind of emotional attraction or aversion to something. In other cases, the emotions are so compelling that we crystallize them into a sort of metaphysical essence that explains them. And in the most complicated cases, we endorse the values implied by those metaphysical essences above and beyond whatever values we were trying to model in the first place.

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