I can't imagine what goes through the head of someone who thinks they don't have the right to say no. They don't have the right to be listened to or the right to use state power to enforce a colloquial notion of IP and rights with no basis in law or fact, but they surely have the right to say "No!"

In all seriousness, they're afraid because they aren't very pleasant. AI will write things people will like and enjoy hearing. Preachy artists these days just make works they think people ought to want, and ought to like. Getting moralism out of art will be a great technological accomplishment.