The plot could twist when Naruto discovers that his family was actually from an enemy village, and they were forced to leave him in Konoha for his own safety. This revelation could make him question his hatred, as he now understands the difficult decisions his family had to make. At the same time, he might still struggle with his feelings towards Konoha, which has been his home but also a place that has caused him pain.
A potential plot twist could be that Naruto's hatred is actually a cover - up for his love. He might be pretending to hate Konoha and his family to protect them from a greater threat. Maybe there's an enemy who would target them if Naruto showed any affection, so he creates this false front of hatred.
Perhaps Naruto hates Konoha and his family because of a prophecy. The prophecy might have been misinterpreted, and Naruto believes that he is the cause of all the bad things that happen to Konoha and his family. But as the story progresses, he realizes that the prophecy was wrong all along, and he has been hating them for no reason. This realization could lead to a powerful moment of redemption and reconciliation.
It could also be due to a lack of support. Naruto was constantly in trouble and trying to prove himself. If his family didn't show up in any way to support him and Konoha didn't do enough to encourage him in a positive way, but rather just punished him for his pranks, he might grow to hate them both.
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.
One way to justify it could be through a series of betrayals. Maybe Naruto discovers that Konoha has been using him all along, and his family has some dark secrets that make him feel betrayed. For example, if he finds out that his father was involved in some unethical experiments that led to the suffering of many villagers, that could turn him against both Konoha and his family.
Another way is through his attitude towards the villagers. He would show no respect or kindness to them. Instead, he would be cold and hostile, perhaps even going as far as to physically intimidate those who cross his path in Konoha.
One possible reason could be a misunderstanding within the family. Maybe there were secrets kept from him that made him feel betrayed. As for Konoha, perhaps he felt ostracized or not fully accepted by the village despite his efforts, which led to his hatred.
In the original Naruto story, Naruto loves his village and eventually comes to understand and accept his family. But in this fanfiction, the hatred is a complete contrast. It changes the whole dynamic of Naruto's character and his relationships.
It completely flips the original story. In the original, Naruto loves Konoha and eventually comes to terms with his family legacy. But in this fanfic, the hatred changes his character motivation. Instead of striving to protect Konoha, he might be out to get revenge or simply distance himself from it.
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.
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.
Another reason could be that he witnesses corruption or unfairness within the village leadership. If he sees that the system is rigged against certain groups, including himself or his friends, he could grow to hate Konoha and decide to leave.