Dumbledore might underestimate it because he's used to the 'official' version of the wizarding world. Fanfiction can be full of wild ideas that don't fit his traditional view.
Well, Dumbledore is a very proper and traditional wizard. Fanfiction often has a lot of modern and sometimes unorthodox ideas. He may not understand or value these new takes on his world. Also, he's so focused on the real threats and events in the wizarding world that he may not pay attention to the creative outpouring of fanfiction.
Dumbledore is a character from the original Harry Potter series which has a set narrative. Fanfiction, on the other hand, goes beyond that. It can rewrite characters, create new relationships, and change the whole course of the story. Dumbledore, being part of the original structure, may not be able to appreciate this deviation. He might think it's a misrepresentation of the world he has dedicated his life to protect and uphold. Also, his age and the way he was brought up in the wizarding world make him more likely to be skeptical of such new - fangled creative works like fanfiction.
In my opinion, Dumbledore would underestimate Harry Potter fanfiction. Fanfiction is a realm where fans take the original story and run with it in all kinds of directions. There are fanfictions that change the personalities of characters, create new storylines that deviate greatly from the original. Dumbledore, who is bound by the original narrative and his role in it, may not understand the significance of this new wave of creativity that fanfiction represents. He may see it as a distortion of the world he knows rather than a celebration and expansion of it.
Well, one reason could be that it's often seen as just a derivative work. People might think it can't be as good as the original series. But they're wrong. Fanfiction allows for so many creative interpretations. It can explore different character backstories, relationships in ways that the original might not have. It gives fans a chance to be creative and add their own ideas to the Harry Potter universe.
For the sake of creating a unique plot. The 'Harry Potter' series has a well - established story, and by changing such a fundamental relationship as Harry and Dumbledore's, the author can draw in readers who are interested in seeing a fresh take on the familiar world. It can also open up new storylines that might not have been possible in the original series, like how Hogwarts functions without Harry having Dumbledore as a guiding figure.
Maybe he takes it out of a sense of duty. Harry might feel that he needs to carry on Dumbledore's legacy and that using his wand is a way to do that. He could believe that Dumbledore's wand holds the power to defeat the remaining threats to the wizarding world.
Maybe it's a plot twist to create more drama and conflict. Fanfiction authors often come up with wild ideas to make the story more exciting.
In some fanfictions, Dumbledore might bow out of respect for a powerful magical entity or a person with extraordinary abilities. It could also be a sign of his humility in the face of a situation where he realizes he is not the most knowledgeable or powerful.
It could be because of a deep-seated grudge or misunderstanding. Maybe Harry felt betrayed by Dumbledore's actions or decisions.
Perhaps Harry was feeling betrayed or misunderstood and wanted to express his strong emotions directly to Dumbledore through a howler. This could be a way to make his point and demand a response.
One reason is that fans like to explore different perspectives. In the original books, Dumbledore is presented as a wise and mostly benevolent figure. But some fans want to see what would happen if he had a darker side. It adds a new layer of complexity to the story.
In some fanfictions, female Harry Potter might hate Dumbledore because the author wants to create a different dynamic. Maybe Dumbledore's actions in the original story, like keeping secrets from Harry, are exaggerated in the fanfic. For example, if he withheld information that could have saved someone she cared about, it could lead to her hatred.