For example, humans, even from infancy, prefer games where it is possible to punish cheating (i.e. take revenge upon cheaters) to games where it is not. This isn't just "we're animals that have evolved to enact tit-for-tat strategies [by e.g. injustice triggering rage] because they lead to cooperation which leads to egalitarian utility"; this is actual analysis—instantaneous, intuitive analysis—of a system of rules, to notice, in advance of ever being slighted, whether you'll be likely to end up in an "unjust" social situation if you agree to the given ruleset. There is an "accelerated co-processor" of high-level abstract game-theoretic information—and layers to extract that information from sense-data—that ship as part-and-parcel of the human brain model. We never need to learn how to judge unfairness, any more than we need to learn how to see.