I wrote DeathWalker over 15 years ago, because I felt [at that time] Vampires were becoming far too weak and sensitive. Look what they have done since! Now they look like they belong on GQ!
Something to fear--such as a killer who is controlled by the blood of the living--is something that you cannot reason with. So my Vampire--although capable of emotion--is primarily a killing machine to be fed. Plus, anyone with a brain for math or a good calculator knows that you can't have them multiplying like rabbits, if they are to exist undiscovered. A valid conservative statistic is that over 300,000 people disappear in the U.S. each year, and only half of these are intentional. Only a few thousand could support a small number of Vampires.
Yes, my Vampire has a mate; mine can feel love for that mate, and mine can feel revenge. He walks the edge of the population and he is also very hungry.