The wizarding world would likely be in shock. Harry was seen as a hero, and this act would completely change their perception of him. Some might think he was finally getting revenge for all the abuse he endured, but many would condemn his actions as murder is still a serious crime in the wizarding world.
There would be a divide in the wizarding community. Those who knew about the Dursleys' treatment of Harry might feel some sympathy, thinking that they pushed Harry too far. However, others would be horrified and demand justice. The Ministry of Magic would probably have to get involved and there would be a trial. Harry's friends would also be conflicted; some might stand by him while others would be disgusted by what he did.
The reaction would be complex. The media in the wizarding world would go wild, with headlines everywhere. Some families who had also been hiding Muggle - born wizards might be worried that they could be next if a hero like Harry could turn on his Muggle family. There would be a lot of discussion about nature vs. nurture and whether Harry's upbringing with the Dursleys was to blame for his actions or if it was his own free will. And the magical law enforcement would have a difficult time dealing with the situation as Harry is a very powerful wizard and has a lot of supporters as well as detractors.
They would be devastated. Harry has many friends and allies. People like Hermione and Ron would be heartbroken and would probably seek revenge. The Hogwarts faculty would also be deeply affected. Dumbledore, if he's still alive in the fanfiction, would feel a great sense of guilt for not protecting Harry better. There might be a split in the wizarding community, some believing the Dursleys were acting on their own, others suspecting a darker conspiracy.
The wizarding world's reaction would be complex. On one hand, Harry's friends like Hermione and Ron might be conflicted. They know the Dursleys were awful to Harry, but they also believe in the value of life. Wizards who have a strong sense of justice might understand Harry's actions, especially those who have also faced prejudice or abuse. But the more traditional and law - abiding members of the wizarding community would condemn Harry, and the Ministry would likely try to arrest him, leading to a possible conflict between those who support Harry and those who don't.
The wizarding world might be very concerned. Dumbledore would surely keep a close eye on Harry. There could be secret attempts to check on him without the Dursleys noticing. Wizards might be worried that the Dursleys would influence Harry negatively, especially regarding his views on magic.
The Ministry of Magic would be in a difficult position. On one hand, they would need to keep the wizarding world calm. On the other hand, they would have to deal with the fact that a muggle family killed a famous wizard. There would be debates about how to handle the Dursleys. Some might want to obliviate their memories and send them to Azkaban, while others might think that a more public trial is necessary to show that the wizarding world does not tolerate such actions against one of their own.
One possible plot could be that Harry finally snaps after years of abuse from the Dursleys. He might discover some dark magic that he uses against them in a fit of rage. Maybe he finds out they were involved in something really evil that endangered his life all along, and that's what drives him to murder them.
This type of fanfiction has significant ethical implications. It changes the fundamental nature of the relationship between Harry and the Dursleys. In the original, Harry overcomes the Dursleys' cruelty through his own strength and the support of his friends at Hogwarts. By having him murder them, it's a complete subversion of that positive arc. It also sets a bad example for younger fans who look up to Harry as a role model, making it seem like violence is an acceptable way to deal with those who wrong you.
In the 'the dursleys abuse harry fanfiction', the abuse can be multi - faceted. Physically, Harry could be pushed around or hit by Vernon. Emotionally, Petunia might constantly compare him unfavorably to Dudley, which is really damaging to Harry's self - esteem. And socially, they might prevent him from having any friends over, making him feel completely alone in the world.
Yes, there might be some out there. Some fanfictions that explore such a dark and extreme concept can be well - written in the sense that they might have a complex plot, in - depth character exploration, and good writing style. However, it goes against the general positive image of Harry Potter in the original series.
The Dursleys' reaction would be complex. Vernon would be enraged and might even try to burn any fanfiction he found. Petunia would be conflicted. Part of her would be disgusted, but a small part might be a bit curious as she has some connection to the wizarding world through Lily. Dudley might be more interested than his parents, especially if the fanfiction had some action or adventure that appealed to his more adventurous side.
They would likely be disgusted. The Dursleys are so anti - magic that any form of fan - created stories about the magical world would be abhorrent to them.