(Sunglasses: just incase your dealing with Edward Cullen, the sparkler.)
Del Toro and Hogan trace the origin of vampires back to the varying culture based legends they come from. They are able to adapt to any story they are a part of and speak to what the time period calls for. For example Dracula glorified scientific reasoning mid- technological revolution. It gave society a break from historical religious reason, which was what they needed in their media and culture then. We are able to fear and free our inhibitions that are otherwise hidden.