One reason is that it can be a way to deal with the 'what - ifs' in the story. What if Hermione couldn't handle Harry's fame or the constant danger around him anymore? What if she had her own secrets that made her distance herself from Harry? These fanfics allow for the exploration of such complex emotions and situations that might not be fully explored in the original series.
Some 'Hermione breaks Harry' fanfics exist because it offers a new and different take on their relationship. The traditional view of their friendship is so strong that exploring a break in it creates a lot of drama and emotional tension, which is interesting for readers.
Well, it might be because the writers want to explore the individual characters more deeply. By having Hermione break from Harry, they can show how Hermione grows independently. Maybe she realizes that she has been too dependent on Harry in their adventures and wants to break free to find her own path. Also, it could be a way to introduce new plotlines and conflicts in the fanfic world. It allows for different pairings and alliances to form once their relationship is broken.
Some exist because it creates a really intense and dramatic conflict. Bellatrix is a very powerful and cruel character, and Hermione is a strong - willed heroine. Putting them in a situation where Bellatrix tries to break Hermione makes for a very engaging read.
Well, it could be to show different relationship dynamics. In the original story, they are very close friends. By having Harry leave Hermione, it can show how their friendship can be strained and how they might react to such a big change. It can also lead to new plotlines like Hermione having to form new alliances or Harry finding new friends in different places.
Some 'Harry Hurts Ginny' fanfics exist because it adds a new layer of drama to their relationship. Their relationship in the original series was mostly positive, but exploring the negative aspects like Harry hurting Ginny can make for an interesting and complex story.
Well, there might be a fanfic where Hermione breaks Harry's heart due to her falling in love with someone else in the wizarding world. It could be a character we least expect, like a foreign wizard who visits Hogwarts. This would completely shatter Harry as he has always counted on Hermione's loyalty and friendship. In some fanfics, Hermione's family issues might also play a role. If her Muggle parents were in danger because of Harry's actions, she could break off their friendship in anger.
One reason could be for the sake of character exploration. Writers want to see how Harry would develop if he embraced different, often 'feminine' qualities. It adds a new dimension to his character.
Stress and danger can also be reasons. When facing a powerful dark wizard or a difficult situation at Hogwarts, the pressure can get to them. Harry may yell out of frustration at not being able to find a solution quickly, and Hermione might yell back as she tries to keep him calm and rational. In a fanfic, this can create a lot of emotional turmoil and keep the readers engaged.
Some people like these fanfics because it offers a different take on their relationship. In the original books, their relationship is mainly platonic, so seeing Harry flirt with Hermione is a fresh and exciting idea.
Sometimes it's to show a conflict in their relationship. Ron and Hermione have a complex relationship, and a slap can symbolize a breaking point in their interactions.
It also allows for character growth. After Percy snaps, they can have a journey of making up, understanding each other better, and becoming stronger as a couple or as friends. This type of plot can be very appealing to readers who like to see relationship development in fanfics.
One reason is that they want to explore a different narrative. The Harry Potter series has a huge fan base, and some fans feel that the relationship between Harry and Hermione could have been developed in a romantic direction. So, they write fanfics to fulfill that creative urge. They can also add their own twists and turns to the relationship, like having them face unique challenges together that bring them closer romantically. It gives fans a chance to expand on the world and characters they love in a new way.