Well, it might be for the sake of creativity. The Naruto fandom is huge, and some writers want to stand out by creating a very different scenario. They might think that by killing Naruto in action, they can open up new storylines that haven't been explored much in the original series. Maybe they want to show how the village would cope with the loss of their hero, or how new threats would emerge without Naruto there to protect it. It gives them a chance to rewrite parts of the Naruto world in a more somber and less predictable way.
One reason could be to explore the darker side of the Naruto universe. Writers might want to see how the characters and the world would react to such a major loss.
One possible reason could be to explore the darker aspects of the Naruto universe. By making Naruto a pickpocketer, the author can show how even a good - natured character like Naruto could be corrupted by certain circumstances. For example, if his village was destroyed and he had no means to survive, he might resort to pickpocketing.
Another reason could be for disguise. Naruto might be in a situation where he needs to hide his identity. By covering his eyes, which are a very recognizable feature of his, he can make it more difficult for others to figure out who he is. This could be especially important if he is in enemy territory or trying to infiltrate a group secretly.
Some creators might want to explore the 'what - if' scenarios. Maybe they wonder how the Naruto universe would be different if Naruto had a darker side. It could also be a way to create a more edgy and unique story compared to the typical Naruto fanfictions out there.
One possible reason could be a sign of extreme loyalty and friendship. Naruto might see Yang in a dire situation where she needs his arm for some crucial purpose, like to complete a powerful jutsu or to defend against an overwhelming enemy. He is known for his selfless nature, so sacrificing his arm would be in line with his character.
One possible reason could be for Naruto's protection. His father might think that by locking him away, he can keep Naruto safe from the many threats in the Naruto world, like powerful enemies who might target Naruto for his special powers.
One reason could be to explore a darker side of the Naruto world. Writers might want to see how Naruto's character would develop under extreme circumstances. Another reason could be to create a contrast. By showing Naruto being abused by everyone, it makes the positive aspects of his relationships in the original series seem even more significant.
Some creators might want to explore a darker side of Naruto's character. Maybe they're tired of the always - positive and heroic Naruto and want to see what he'd be like if pushed to the extreme.
Well, it could be for creative exploration. Maybe the writer wants to see how Naruto would turn out if he had a difficult family situation like being abused by his mother. This could then lead to a different path for his relationship with Hinata. It might also be a form of catharsis for the writer, expressing some darker emotions or ideas through this fictional and extreme scenario. Additionally, it could be an attempt to analyze the impact of a negative family environment on Naruto's development in the context of the Naruto - Hinata relationship.
One possible reason could be that the Kyuubi's power goes out of control completely. Since Naruto has the Kyuubi inside him, if he fails to maintain the balance, the Kyuubi's raw and unrestrained power might end up killing him.
It could be for shock value. Some writers might want to create a really out - there story to get people talking.