Maybe Harry Potter refuses to help fanfiction because he values the integrity of his own story as told by J.K. Rowling. Fanfiction can sometimes take the characters in very different and perhaps inappropriate directions, and he wants to stay true to his original adventures. For example, in some fanfiction, characters might be made to do things that are completely out of character for them. Harry is a hero with strong values, and he wouldn't want to support something that could undermine those values.
Well, it could be because fanfiction often goes against the original vision of the author. Harry Potter might not want to be part of something that could distort his story or the world he belongs to.
One possible reason could be that fanfiction often takes creative liberties with the original story and characters. Harry Potter might be seen as a very personal creation of J.K. Rowling, and she (or in this case, the fictional Harry Potter) may not want it to be distorted in fan - made stories. Fanfiction can sometimes change the essence of the characters or the plot in ways that go against the original vision.
Perhaps they fear that fanfiction could deviate too much from the original themes and values of the Harry Potter series. The official story has a certain moral and ethical framework, and fanfiction might distort it.
Maybe he has a very traditional view on literature. He might prefer to stick to the original works and not engage with the fan - created versions. Fanfiction often takes the original story in different directions which he may not like.
Maybe Naruto has had some deep misunderstandings or grievances with Konoha that make him unwilling to offer help.
Maybe he has his own personal reasons. He could be afraid of failure, or perhaps he doesn't like the competitive environment. Another possibility is that he has some moral objections to the nature of the competition in the fanfic.
There could be ethical reasons. Fanfic sometimes involves using characters and settings created by others without proper authorization in a more complex way than just being inspired. Harry might not want to get involved in teaching something that has such potential legal and ethical gray areas.
Maybe he has his own reasons. He might be tired of the responsibilities that come with being a hero. In the fanfic, perhaps he has seen the dark side of heroism, like the constant danger and the loss of personal freedom. He could also be a complex character who doesn't conform to the typical heroic image.
Maybe he has some personal grudges against the village. For example, he might have felt betrayed by the village in the past and that made him reluctant to offer help.
Maybe he has some personal grudges or misunderstandings within the family in the fanfiction. It could be that something happened in the past that made him feel betrayed or unappreciated, so he refuses to offer help.
Maybe in the fanfic, Harry has his own ideas and beliefs that conflict with Dumbledore's. He might think Dumbledore's plans are too risky or not in line with his own sense of justice.