One possible reason could be a misunderstanding. Perhaps Naruto misinterprets some of his family's actions or words. Maybe he thinks his family didn't care about him as much as he thought they should. In fanfiction, authors often play with the idea of miscommunication and how it can lead to strong negative emotions like hatred. Also, if there are other characters in the fanfiction who influence Naruto's view of his family, say by spreading false rumors or manipulating him, that could contribute to his hatred.
One possible reason could be that he discovers some long - hidden family secrets that make him feel betrayed. For example, if he finds out that his family was involved in something unethical in the past. Another reason might be that he feels constantly overshadowed by his family's legacy and can't form his own identity within the family, so he decides to leave to find himself.
It can be quite divisive. Some fans might be extremely offended as Naruto is a beloved character known for his positive traits. This type of fanfiction goes against the established character arc and values. It could make some fans angry that someone would distort Naruto's character in such a way.
The plot might start with Naruto gradually realizing certain things about his family that make him feel angry or betrayed. For example, he could find out about a hidden deal his family made that he doesn't agree with.
One way could be through Naruto feeling neglected by his family. Maybe in this fanfiction, his parents were alive but were always too busy with village affairs, leaving Naruto feeling alone and unloved. This could lead to his hatred as he grows up seeing other families being more present for their kids.
It could also be due to differences in values. If Dark Naruto had different beliefs about power, friendship, or loyalty compared to his family, and they constantly clashed over these, it might lead to his hatred. For instance, if his family adhered strictly to Konoha's traditional values but he saw them as restrictive.
He might try to prove himself. Naruto could focus on becoming stronger and more successful as a ninja. By showing his family that he can achieve great things and that he's a good person, he hopes to change their minds. For example, he might take on difficult missions and complete them with excellence.
One common plotline could be Naruto leaving his family behind and finding a new family in his friends. For example, he might feel so estranged from his blood relatives that he decides to build a closer bond with Sasuke, Sakura, and Kakashi, seeing them as his true family. Another plotline could involve Naruto trying to discover the reasons behind his hatred. Maybe he uncovers some long - hidden family secrets that made him develop such strong negative feelings.
It could also be due to some external influence. Perhaps an enemy manipulated Naruto's mind in the fanfiction, making him see his family in a negative light. This enemy might have used some form of mind - control or false memories to turn Naruto against his family.
Well, it's possible that there is a 'Naruto is homicidal hates his family' fanfiction. If so, the plot could be set in a world where Naruto discovers some sort of dark secret about his family that he misinterprets. For example, he might find out that his father sealed a powerful and dangerous entity within him, and instead of understanding the sacrifice his father made, he sees it as an act of aggression. As a result, he starts to hate his family and becomes homicidal. But again, this is a very different Naruto from the one we love in the original work.