The world is fine (if flawed and sometimes generic). The real issue is there isn’t a single good character in them. Hermione is alright, with her desire to free the elves and generally no accepting of the status quo. Even she seems to stop caring about this after they’re free and capable of doing something about it. There’s not a single progressive person in those worlds. There are only not totally evil (but accepting of banal evils) people. Being against Hitler doesn’t make you a good person, it only makes you not a literal Nazi.