I mean, I don’t care for the character either, but he is a handy example of a character acting against the tendency of their people.
Why does “aren’t universally evil” = “people in costumes?” And why do you never see this particular critique levied at non-evil humanoids like elves and dwarves?
They don’t just look humanoid, they are classified as humanoids. As well, they are consistently depicted as having society, culture, and the capacity for rational thought. They are a people. They may be a monstrous people, even an evil people in your world, and that’s your prerogative. But they are a people by any meaningful definition of the word.