If they were so overtly bad that there was never a single question about a single one of them having any humanity or even being able to be redeemed, we wouldn't need to teach that they are evil bad guys.

Vampires, zombies, aliens are all instinctually feared by humans without needing to be taught. Once we can conceptualize fear/disgust, we hate them until we are taught otherwise.

So why do the Nazis need us to be taught that from every single angle? Almost like they are trying to build a brainwashing narrative to make sure you never question a thing about them, ever.