Well, for the creativity. It's a chance to explore a different scenario. The original story has a set path, but by having Harry stolen from Voldemort, writers can create new plotlines and character developments. It gives a fresh take on the familiar characters and world of Harry Potter.
Some writers might do it to explore different relationships. In the original story, Harry has certain relationships based on his upbringing and the events that follow Voldemort's actions. But if he's stolen from Voldemort, new relationships can form. For example, he could have a different relationship with the Death Eaters or other dark wizards, which makes for an interesting story. Also, it allows for a different view of Harry's power development and how he uses it in this new context.
Another reason could be to subvert expectations. Fans are so used to the original story that a fanfic like this can shock and intrigue them. It can make them think about what could have been. And by changing this one major event, the writer can create a whole new universe within the Harry Potter world. They can rewrite the rules, so to speak, and show a different side of the magical world that we thought we knew so well.
Some might write it to explore a different side of the characters. It's a way to show how Harry and Sirius could be pushed to their limits and what they would do in extreme situations.
Well, it could be for power. Maybe Voldemort realizes that by saving Harry, he can gain some sort of power over him or use him as a tool in a more elaborate plan.
Some might write it for the sake of pure creative exploration. They want to see how a well - known character like Harry could fit into a different historical context, even if it's a controversial one like the Confederacy.
Some writers might do it to make a statement about how Harry Potter, who is used to the grandeur of Hogwarts and the wizarding world, can adapt to a very different and confined space like a fridge. It could be a study of his character's adaptability. Also, it could be a form of satire, poking fun at the sometimes overly - serious nature of the original Harry Potter stories.
One popular one might be 'The Stolen Boy' where Harry is taken from Voldemort's clutches in a very unexpected way. It has a unique plot where the wizarding world has to deal with the consequences of Harry being in a different situation than in the original story.
Some people might come up with such out - of - place ideas just for shock value. They want to create something that is so different from the original that it grabs people's attention, even if it's in a negative or inappropriate way.
It could be for comical purposes. The idea of the powerful and heroic Harry Potter having to deal with something as mundane and embarrassing as wearing diapers can be quite humorous. It adds a touch of absurdity to the usually serious Harry Potter universe.
One reason could be to explore alternative scenarios. They might think 'what if Naruto had this super - broken power?' and write a fanfic around it. Also, it could be a way to stand out. In a sea of Naruto fanfics, having a really out - there concept like a 'broken' Naruto might attract more readers.
It could be that they have a very different interpretation of Naruto's character. However, this is a very extreme and negative way of expressing that view. They might not understand or appreciate the values and growth that Naruto represents in the original story, and instead choose to write something so unkind.
Some people might write it for shock value. They want to create something that is so out - of - the - box and unexpected that it grabs people's attention. It could also be a way for them to explore very extreme and dark 'what - if' scenarios in the Harry Potter universe, even if it goes against the original story's essence.