"Oh, you people with your squishy feelings will occasionally meet someone else with compatible squishy feelings and then the vampire or vampires of the pair will squishy feelings to end all squishy feelings forever and ever. If somebody present is human they don't tend to stay that way. Can't be losing your eternal mate to ordinary human mortality, to say nothing of how awkward it would be to consummate the relationship and how poorly mated vampires sometimes deal with unreciprocated eternal adoration."