I’ve long connected the folklore of vampires with the predations and tyrannical whims of the ruling class of medieval Eastern Europe.
It’s speculated that the accusations of blood draining, impaling, servent torture, and virgin killing against aristocrats and royalty came from rival political families. These stories were spread to common folk and likely became the influence for vampire folklore. It was an early form of a psyop on the public to roust support for ouster or execution.
RAD