To explore different aspects of their relationship. By having Ginny lie, it can show how much trust there really is between them. It can also be a way to show how they grow and learn from such situations. For example, if Ginny lies about something small at first and then it escalates, it can be a journey of self - discovery for both of them in the fanfiction.
For the sake of creating drama. Lies can easily stir up emotions and conflicts, which makes for an interesting plot. It keeps the readers on their toes, wondering when the truth will come out and how Harry will react.
Well, some authors might want to explore different character arcs. By having Ginny dump Harry, they can show Ginny as a strong - willed character who is not afraid to make tough decisions. It also adds drama to the story, as the relationship between Ginny and Harry is a central part of the Harry Potter universe.
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.
Some exist because fans like to explore different power dynamics in relationships. They want to see how Harry, as a central and powerful character, can influence Ginny's actions and decisions.
Perhaps in a fanfiction, Ginny lies to Harry about being in danger to draw him out for a surprise party that she has planned with all their friends. It starts with her sending him a false distress signal, and when he arrives, he is met with a celebration.
It might be for the sake of exploring unique and unexpected interactions between the two characters. Their relationship in the original books is complex, and this is a very different way to add a new dynamic.
Some people write it because they simply have different ideas about who Harry should be with. They might have a favorite character other than Ginny and want to explore a relationship between Harry and that character. Maybe they didn't like how Ginny was written in the original books and feel the need to rewrite the story in a way that suits their view.
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 writers create these fanfics because it allows them to explore different character dynamics. When Voldemort cheats, it shows his desperation or his devious nature in a new light. And it also gives Harry a different kind of challenge to overcome, not just a physical or magical one but also a moral and strategic one. For example, if Voldemort cheats by bribing people around Harry, Harry has to decide how to deal with those who have been turned against him, whether to forgive or fight back.
Some authors write these fanfictions to show different sides of the characters. For example, Snape's action of hitting Harry could be a result of his own inner turmoil, perhaps related to his loyalty to Dumbledore and his hatred for James Potter. By writing about this, they can show Snape in a new light. Also, it can show Harry's growth in dealing with such a difficult situation. He can either become bitter or try to understand Snape's motives, which are interesting character development arcs.
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.