Why do some 'strong naruto kakashi bashing fanfiction' exist?

There are a few reasons. One is that some fans are really passionate about Naruto and they feel that Sakura didn't treat him fairly early on. So they use fanfiction to express their dissatisfaction. Another reason could be that compared to other characters like Naruto and Sasuke, Sakura's power progression might seem less exciting to some. So they create fanfictions to emphasize this perceived shortcoming. Also, there could be a sense of competition among fans for their favorite characters, and Sakura might be the target for those who prefer other characters in the Naruto world.

Well, one that comes to mind might be 'Naruto's Ascent'. In this fanfic, Naruto is made super strong early on and Kakashi is sort of sidelined and criticized for his teaching methods which are shown as ineffective. Another could be 'The New Path of Naruto' where Naruto discovers a new power source and Kakashi's role as a guide is bashed as he fails to recognize Naruto's true potential.

Some exist because fans might feel that the concept of time travel in the Harry Potter series was not fully developed. They use bashing fanfiction to explore the flaws. For example, in the books, time travel seems a bit too convenient at times.

Some people write it because they want to explore alternative storylines. Maybe they think the original Team 7 is too 'perfect' in a sense and they want to see how things would play out if they were different. Or they might just not like certain aspects of Team 7 and use the fanfic as a way to express their dissatisfaction.

Some people write these fanfics because they feel Dumbledore had too much control in the original story. They see Lord Potter as a powerful character who could have made different choices without Dumbledore's interference.

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.

One common theme could be Kakashi's teaching methods being criticized. Some fanfictions might show his training of Team 7 as ineffective. Another theme could be his past actions being questioned, like his role in certain missions. And sometimes, his relationship with other characters, such as Naruto, might be re - imagined in a negative light.

Some exist because some fans really ship Harry and Hermione (HHR) and feel that the Weasleys, especially Ron, are in the way of their ideal pairing. So they create fanfics to bash the Weasleys to make their preferred relationship seem more likely.

Some writers might create such fanfictions to be edgy or different. They want to break the normal, positive image of Naruto and Hinata's relationship just to shock readers.

Well, for some writers, they might be frustrated with certain aspects of Team 7 in the original Naruto story. For example, if they didn't like Sasuke's character arc, they would write bashing fanfiction. Or perhaps they felt that Naruto was too much of a Mary Sue - like character and wanted to deconstruct him in their own way. Also, some might do it just for the shock value, to create a stir among the Naruto fan community by presenting a very different and negative view of the beloved Team 7.