The world is an extremely mysterious place, it is like a giant dark ocean that hides many secrets within its depths. Within those depths for example, there is an infinite variety of life, most of which, contrary to what science would tell us, exists completely outside of humanities purview. Besides being an infinitely mysterious place, this world is also a predatory world, it is generally the case that one life form will need to consume, some or all of another life form, in order to survive.
In our modern society, vampires have become a very powerful archetype, for the hidden predatory life that exists outside the purview of man. I find this very fitting, because it is my opinion that no other creature bridges the gap, between man and that predatory darkness better than the vampire.