There could be a lack of understanding of the Harry Potter universe. If someone doesn't fully grasp the essence of the magical world, they might think it's okay to introduce elements like gun running. Or perhaps they are trying to make a statement about modern - day problems by forcing them into the Harry Potter setting, but this is a very clumsy way to do so as it completely violates the integrity of the original series.
Maybe it was an accident. Harry Potter was experimenting with some dark magic (which he may have been forced into or just out of curiosity) and things got out of hand, resulting in the creation of the plague.
Yes, it is. The Harry Potter series is a world of magic, not about gun running which is a completely different and often dangerous and illegal concept in the real world. This kind of fanfiction goes against the very essence of what the original series represents.
Another reason could be a build - up of years of pent - up anger and frustration. Snape has been harsh on Harry throughout his years at Hogwarts. Harry has had to endure Snape's unfair treatment, and all of that negative emotion could explode in a moment of extreme stress or danger, leading him to stab Snape.
One possible motive could be misinformation. If Harry is fed false information about Sirius being a traitor or a danger, he might act on it. For instance, if a well - disguised Death Eater manages to convince Harry that Sirius has joined Voldemort, Harry, in his haste to protect others, could attack Sirius.
Maybe Dumbledore believes that Harry has some hidden power that is being corrupted by the environment at Hogwarts. So, he kidnaps Harry to a secluded place to train him and help him control this power without any distractions or negative influences from other students or even some of the teachers.
One possible motive could be to taunt Harry. Voldemort might see it as a way to show his superiority and to get under Harry's skin. It could be a form of psychological warfare.
Some may create a 'homeless kid fake story' to gain attention. They want others to think they are kind - hearted or to make themselves look important in the eyes of others.
One possible motive could be extreme revenge. After years of being mistreated, locked in a cupboard, and generally being made to feel unwanted, Harry might snap in fanfiction. Another could be a sense of self - preservation if the Dursleys were somehow involved in a plot against Harry's life in the fan - created plot.
Lucius may also have a moment of moral awakening. Despite his past actions, he could see the value in Harry's life and the good that he represents. Maybe he has a change of heart after seeing the destruction caused by Voldemort's actions and decides to do the right thing for once by saving Harry.
In a fanfiction, Dumbledore might steal out of desperation. Suppose there was a situation where a curse was about to be unleashed on Hogwarts, and the only way to stop it was by stealing a particular ingredient for an antidote from a place where it was not supposed to be taken. Dumbledore, seeing no other option, decides to steal it. His motive here is to save the school and its students, even if it means breaking the rules.