AI programs don't create art from thin air. They create art from the tens of thousands of images they were "trained" on: images created by actual artists, mostly without the artists' permission.
How can you accuse someone of theft when your entire work was created by stealing from thousands?
Yes, I'm aware, but many of the AI fanboys literally aren't.
They think that AIs being "trained" by being fed artwork to mix up and regurgitate is no different from being taught or inspired by another artist's work.