They're really afraid of this:
To be fair, we're pretty sure this crew could whoop the cast of Twilight hard.
It's the sexual seduction aspect that's driving the whole vampire phenomenon right now, so let's start there. Vampires are so damn sexy right now, advertisers have even started using vampire imagery to help sell their shit, from razors to cologne.
No, vampires wouldn't need razors. Let's not start that argument.
The idea of the sexy vampire is something Bram Stoker essentially invented -- before that, vampires in folklore were basically walking corpses. Dracula reinvented the vampire as someone whose bones you would walk over your mother's grave to jump. It worked then for the exact same reason they work now -- they were the absolute inversion of conservative Victorian ideals. Prim and proper English ladies, after being bitten by the Count, became oversexed slutbags who abandoned their maternal duties to indulge in depravity. The motive of the vampire invasion was to turn England into the Jersey Shore.
A fate worse than crumpets.