Dumbledore is one of the most well-known and also controversial figures in Harry Potter. While he started off as a benevolent mentor figure to Harry who likely had a few secrets, he turned out to be a person who used and manipulated Harry to try and help save the world. We also learned of Dumbledore’s past with Grindelwald and his troubling past when it comes to Muggles, making it harder for many fans who like Dumbledore to defend him. As a headmaster of Hogwarts, Dumbledore might not have been as great as it seems at face value, and there are likely other professors that could have done a better, more focused job.