I think that is a good argument, but conflates is and ought, and I have two counters:
copyright owners can dictate how their work is used (with some exceptions), and if that use hurts the copyright owner, the owner should have the right to forbid it.
the intent of copyright is to reward and encourage creators and creativity. If a script kiddie can just train a model and duplicate the hard-won aesthetic work of Molly Crabapple or Ralph Steadman or anyone at all, and either dilute the value of it or actually profit from it, what is the incentive for creators to create new work at all?