This should add a disclamer that there are several ways to fight these sadistic killers, since they are quite cowardly. You can start with crosses, rosaries, dradels, Christmas trees, jackolanterns, easter eggs, flags, wind chimes, toras, ouigi boards, Elvis records, miniskirts, computers, deodorant, college brochures, books and reading in general, and cigarettes.
Just to name a few... 
Anitar