I always thought of vampires, especially the young-adult ones, as a metaphor for sex - sucking blood, forbidden, taboo. I think they just ooze sex. Vampires are all the big themes in life in one attractive, bloodsucking package.
“Their plan is to return the entire world - not just the Middle East - to the days of the caliphate and either convert all of us so-called infidels into born-again Islamic believers or kill us.”