Another reason could be to create a new and unique storyline within the 'Twilight' universe. Since the original story has been so well - known, some fanfiction writers may feel the need to come up with something extremely different to stand out. They might think that by creating this very dark and controversial scenario, they can start a whole new discussion about the characters and their potential in different situations.
One possible reason could be to create shock value. Writers might want to break the expectations of readers who are familiar with the loving relationship between Edward and Renesmee in the original 'Twilight' story. By creating such a dark and unexpected scenario, they hope to grab the attention of readers who are looking for something different from the usual fanfiction.
One possible reason could be Renesmee's growing independence. As she matures, she might want to make her own decisions which could conflict with Edward's over - protective nature. For example, she may want to explore the world more freely, while Edward, fearing for her safety, tries to restrict her.
One reason could be that he doesn't like how some fanfiction writers misinterpret his character. They might make him act in ways that are completely out of character in relation to Renesmee. He has a certain image of himself and his relationship with her, and fanfiction can mess that up.
Maybe the creator wants to explore a different side of Pikachu's character. In the official story, Pikachu is loyal and friendly, but in this fanfiction, it could be a way to show a corrupted or influenced Pikachu. Also, it could be a way to deconstruct the typical hero - sidekick dynamic between Ash and Pikachu and make readers think about their relationship in a new way.
Perhaps it's related to his internal conflict regarding his relationship with Bella. He might be feeling so much guilt about bringing her into the dangerous vampire world that he has a moment of self - destructive behavior where he almost kills her. Or it could be a plot device used by the author to create more drama and tension in the story, making the readers more engaged as they wonder how Bella will survive and how their relationship will recover from such a traumatic event.
Some authors might create it as an exercise in 'what - if' scenarios. They want to break the established narrative and see how different characters would react if Harry was killed so early. Also, it could be a way to explore the Dursleys' characters more deeply, showing just how far their hatred for Harry could go.
Some fans might create such a disturbing fanfiction as a form of extreme dark - themed exploration. They may want to break away from the typical love - story - esque nature of the 'Twilight' series and create something that shocks and stands out.
In some fanfictions, the power dynamics might be shifted. Maybe Lucius has become more powerful and is on the verge of destroying the wizarding world as Harry knows it. Harry, seeing no other way to stop him, decides to kill Lucius. It could also be a way for the writer to explore the darker side of Harry's character, showing what he could become when pushed to his limits and faced with an unrelenting enemy like Lucius.
One possible reason could be that Renesmee simply has different interests. Maybe she is more drawn to a different lifestyle or set of values that Jacob doesn't align with. For example, she might be interested in exploring the world in a more solitary way while Jacob is more about the pack and community.
It's hard to say for sure if there are popular 'Edward kills Renesmee' fanfictions. If there are, they would likely be a very dark and disturbing take on the 'Twilight' world. It might involve a breakdown in the family structure and a complete subversion of the relationships established in the original. It could also be a way for some writers to explore the 'what - if' scenarios in a very extreme way, but it would be a huge departure from the normal portrayal of the characters.
Perhaps he fears for the safety of the mother or the baby. There could be some sort of danger in the fanfiction world, like a threat from an enemy or a prophecy that endangers their lives, leading him to think abortion is the best option.