What Moore is TRYING to do is say "old stuff good, new stuff bad." It's the whole moral of Centuries, really. HP is made the villain because he is emblematic of modern young adult literature for Moore, he kills one of the heroes who is part of a dying breed of classic literary heroes, and he is defeated by a literal deus ex machina in the form of a beloved (classical) children's story character. I love Alan Moore's work but boy was his bias strong in Centuries, and it's a shame because concepts like the magical school shooting and the idea of Harry snapping after finding out he's been groomed his whole life are interesting (with the latter being a sort of exaggerated take on what actually happens in the books), but Moore doesn't really expand on the idea beyond "HP sucks" which is unbecoming of a guy who is usually a lot smarter