If they have a library in Hooterville, Mayberry, Bedford Falls or Grover’s Corners — they have by now a whole bookcase dedicated to vampire fiction.
The guy may well have been a mental case without it, but he also could have been reading the Bible instead, and been improved. It’s been known to happen. Just not with vampire fiction.
Or he would have been just as nutty, but thinking all his neighbors were Amalekites who needed to be smited.