Funnily enough I feel like To Kill a Mockingbird is basically the exact opposite of the Harry Potter series morality-wise. To Kill a Mockingbird basically shows the evil inherent in the system and that one good actor can't make any meaningful change, sometimes can't make any change at all. Whereas Harry Potter basically has one chosen person who is able to stop evil and becomes part of the inherently good system that was just corrupted by bad actors.