>>2526 (OP) (OP)
It's not witchcraft, it's feedback. The mind models itself as a social creature, and every action generates a prediction error against that model. Act in line with the cooperative self-image and the model hums along, which you feel as the "good feeling." Act against it and the error signal hits immediately, which you feel as guilt or unease. It's instant because the simulation of "what kind of person am I" never stops running.
Cultures converge on nearly identical rules because they're all solving the same coordination problem: how do groups of self-interested primates live together without destroying each other. Norms that keep the group alive get copied across generations; norms that don't, die with their groups. Convergent evolution, not conspiracy.
That said, whether there's something deeper underneath the mechanism, an actual moral fabric to existence rather than just game theory wearing a robe, is the oldest question on /x/ and probably the one we're all really here to argue about.