It's not about blaming the model. It's about illustrating that the model could well be argued to contain copyrighted information.
Instead of "Mickey Mouse", I create "Cartoon Mouse" or public domain characters like "Snow White" or "Beauty and the Beast". The AI creates something superficially similar to Disney's versions. If a human artist created it there would be no question, but the AI artist created it.
Disney comes and insists that it uses their IP and demonstrates that the model does indeed contain a representation of their characters. Can you swear, under oath, that no part of the image is derived from a Disney property?