That may be the case with them. But there's thousands of reports and accounts. If you read enough of them you'll see the consistency. Of course there's discrepancies, but the base elements are consistent.
I agree, but reports of vampires and dragons are very old and too unrealistic to most people today.
I prefer witches, "we" were burning witches like 400 years ago, but the idea is vivid enough today. At that time, many people believed witches were real and the different accusations and account consistent.