Fiction does have a good foot in reality though. There are reasons they are depicted as monsters. They do have that ability and to the families and friends of those who fall victim to one, it is devestating.
[He exhales deeply.]
They aren't human. Though they can pass as them and can usually act like them, they aren't.
The vampires here are provided a lot of alternates. It isn't a necessity to feed one, Acumen provides whatever they need to survive. If they choose to take blood elsewhere, it isn't for survival.
You can be at risk of being turned by offering yourself. Especially if you haven't asked that vampire what it takes to make one in their world.