"Well, the vampires I've met." There was a pause. "Not that I've met many, but the vampires I've met,usually the ones who want to eat you are soulless. Or they all sort of want to eat you, but some refrain because eating people is usually wrong. I'd say, if they're evil, they don't have much of a soul."
It wasn't the best explanation, but it just seemed a given. Vampire = no soul, unless it was Angel.
"I worked for the vampire with a soul. He was...broody." Nice, yes, but the overall feeling was one of brood. "You believe in vampires?"