[int_19h]

But at the same time, there are some aspects of fairness that do appear to be innate - as in, they're observed in very small children regardless of the culture they're from, in experiments where they're asked to share (or not share) something that they have, or assess how someone else shared theirs. Extreme "wealth inequality" - as defined, say, through the amount of candy each child has - is universally seen as unfair, for example, although you also have to account for parochial altruism. Bonobos also demonstrate similar attitudes.

So it appears that our evolution as social species has set some hard boundaries. Abstract ideologies can go beyond them, of course, but their real-world success seems to correlate to some extent with how much they do or not - I would argue that ancap definition of "fair" is so unpopular precisely because it's so out-of-bounds wrt our biology.