the world is big enough that we can find examples to support viewing the world as good and bright as we choose to see it, and plenty of examples to see it as dark and dismal if that is our desire.
This is what I consider the evil aspect of the vampire. Like a cat playing with a mouse, in the legends, they play with humans, emotionally, physically, cruelly. This gives rise to a second type of evil, one that is more prevalent, and very much alive and well, in today's society.
They are constructs of your own mind, created in the patterns of tile designs, painting patterns, towel fibers...the locations may be different, where you see them, but it's always your mind making the constructs.