Creative exploration. Some writers might want to see how the story would change if Harry had a darker side.
It could be a way for writers to explore different moral and ethical boundaries. By making Harry kill people, they can examine the consequences and reactions within the Harry Potter universe. Also, it might be an attempt to create a more edgy and unique fanfic compared to the typical ones that follow the original story closely.
Some writers might want to explore the darker side of the character. They could be curious about how Harry would be if he was pushed to his limits and had to kill in self - defense or to protect others in a very extreme situation.
Well, some writers might be interested in exploring alternate timelines or universes. In a different reality, they might think that Harry could be influenced by dark forces in such a way that he would do something as horrible as killing his parents. It could also be a form of creative rebellion against the established story. They want to break the rules and see where it takes them. And maybe, for some, it's a way to deal with complex psychological concepts, like how a person can lose their moral compass completely.
One reason could be to explore the dark side of human nature. By having Harry kill Ron, the writer might be showing how a good character can be corrupted. Another reason could be to create a shock factor. It's a very unexpected and extreme scenario that can draw readers in.
One reason could be exploring dark themes in the Harry Potter universe in a more extreme way. Some fans might be interested in delving into the psychological struggles that could potentially exist in that world, even if they are very dark. Another reason could be a form of catharsis for the authors, who may be dealing with their own internal issues and using the fanfic as a way to express their feelings in a fictional context.
One possible reason could be extreme despair. Maybe in that fanfic's alternate universe, Harry has lost all his friends and loved ones in a very tragic way, like a second wizarding war that was far more brutal and unforgiving. He might see no way out of the emotional pain and thus choose to end his own life.
In such a fanfic, one possible reason could be extreme depression. Maybe he faced overwhelming losses like the death of his closest friends and felt he couldn't go on. Another reason might be that he was under some kind of dark magic influence that made him lose his will to live.
Some writers might create 'percy tortured fanfic' to shock the readers. It's a way to get a strong reaction and stand out in the vast sea of fanfiction. They might think that by presenting such a disturbing scenario, they can engage readers who are looking for something different from the typical happy - go - lucky fanfic.
One possible reason could be a misdirected spell during a battle. In the heat of a fight, Harry's spell could go awry and accidentally kill Malfoy. Another reason might be if Malfoy was under the control of a dark wizard and was about to do something truly terrible, and Harry had to stop him at all costs, including taking his life.
It could be because of a dark power corrupting Sasuke. Maybe an ancient evil force takes over him and makes him see Sakura as an enemy. In some fanfics, this kind of external influence can completely change a character's actions. Also, it might be related to Sasuke's pursuit of power. If he believes Sakura is standing in the way of his ultimate power - seeking goal, he could be driven to kill her.
One possible reason could be extreme despair. Maybe he faced some overwhelming challenges or betrayals that made him feel there was no way out. For example, if he lost all his friends and felt completely alone in the world of the fanfic.