It could be that they simply want to explore different character dynamics. In the original books, Dumbledore is a very powerful and respected figure. By bashing him in fanfiction, they can create new power balances and relationships within the Harry Potter universe. This allows for a fresh take on the story and can lead to interesting character development that wasn't possible in the original story.
Some fans write it because they feel Dumbledore has some controversial aspects that the original books didn't fully explore. They want to dig deeper into his character and show the darker side that they think exists.
Some fans write it because they feel Dumbledore made a lot of morally ambiguous decisions. For example, his use of Snape was really rough on Snape. He made Snape endure a lot while using him as a spy. Fans might not like this and write bashing fanfics to express their dissatisfaction.
Some fans might feel that Dumbledore was too manipulative in the original series. They create these fanfictions to explore an alternative view where his actions are not excused.
Some fans write it because they feel Dumbledore made a lot of morally ambiguous decisions in the original series. They might not agree with how he treated certain characters, like leaving Harry with the Dursleys. It's their way of exploring different perspectives on his character.
Another reason could be that they simply want to create a different narrative. Maybe they love the Harry Potter universe but feel that Dumbledore was too much of an all - knowing, all - powerful figure. By 'bashing' him in fanfic, they can introduce new plotlines and character developments that deviate from the original and offer a fresh take on the story.
Well, in some fanfictions, Dumbledore is bashed because writers want to explore alternative storylines. They might believe that Dumbledore was too controlling. He made a lot of decisions for Harry without really consulting him. So by bashing him, they can create scenarios where other characters step up or Harry has a different kind of growth without Dumbledore's influence.
Some fans write 'harry potter weasley bashing fanfic' because they are simply bored with the traditional portrayal of the Weasleys. They want to create something new and different. Additionally, they may have had personal experiences that make them more critical of family - like relationships similar to that of the Weasleys. Or perhaps they just like to play devil's advocate and explore how the story could be different if the Weasleys were not as well - liked as they are in the original series.
There are fanfictions where Dumbledore is bashed for his secrecy. For instance, his withholding of information from Harry about his family and his connection to Voldemort. Some female - authored fanfictions might focus on how this secrecy put Harry in more danger than necessary. They might rewrite the story from a perspective where a more open Dumbledore could have changed the course of events for the better.
Some fans might write it because they simply don't like Ron's character. Maybe they prefer other characters like Harry or Hermione more and want to explore stories where Ron is not as central or is portrayed negatively. They could also be trying to create more drama in the story. By making Ron a less - than - ideal character, they can introduce new conflicts and plot twists that wouldn't be there if Ron was his normal self from the books.
Some fanfictions focus on Dumbledore's mistakes in raising Harry. They might show that his distance and secrecy were not just for protection but rather a sign of his lack of true care. For example, in a particular fanfic, Dumbledore is blamed for not being more forthcoming with information about Harry's parents and the prophecy, which leads to Harry making many mistakes and facing more danger than necessary.