Yes. Most stories, especially traditional ones, often have a hidden moral. For example, fables like 'The Tortoise and the Hare' have the moral that slow and steady wins the race. If the story has characters facing consequences for their actions or making choices that lead to different outcomes, it may well have a hidden moral.
Yes, if there are reliable sources or evidence related to the story, such as historical records, eyewitness accounts, or official documents, then it can be claimed that the story is based on true events. For example, if a story is about a well - known historical figure and there are historical texts that corroborate the events in the story, that's a strong indication of its truthfulness.
One could point to the lack of scientific evidence for the extraordinary events in the holy book. For example, if a holy book describes a miracle that defies the laws of nature, from a scientific perspective, it can seem fictional.
There is no evidence to support such a heinous claim in fanfiction. Fanfiction is often a work of wild imagination by fans, and making such false and serious accusations within it is unacceptable. It goes against the positive and creative nature of fan - created works.
There is no evidence at all. J.K. Rowling started writing Harry Potter on her own, with her own imagination. The series has a clear origin story, from her coming up with the idea of a boy wizard to building the entire wizarding world. Fanfiction usually builds on existing works, but Harry Potter is the original source, not the other way around, especially not related to something as unclear as 'belloch' fanfiction.
At present, it seems more like a personal accusation without solid evidence in the public domain. Just because two stories might seem similar on the surface doesn't mean one was stolen. There could be coincidences. However, if the person making the claim can provide things like documented accounts of their story prior to Heard's, and detailed similarities that are too specific to be coincidence, then it could be considered further. But as of now, there's no real evidence.
Well, in some fanfictions, they might point to Harry's extraordinary magical abilities. Merlin was known as a very powerful wizard, and Harry's ability to defeat Voldemort and his various feats could be seen as similar to what Merlin might have done in his time. But it's all in the realm of fan interpretation and creativity.
In most cases, this is a very dark and disturbing concept in fanfiction that has no basis in the original canon. Fanfiction often explores extreme and unethical scenarios for shock value or to push boundaries in fictional storytelling, but there is no real evidence within the legitimate source material to support such a heinous claim.