I don't have a problem with horror films. I have a problem with s.h.i.t.t.y. horror films with cheap CGI effects, bad acting, lousy storylines and shoddy direction. In otherwords SyFy originals. What are they doing this week "Super Massive Octopus Vs Giant Bad Tempered Cobra IV"? The SyFy recipe for an original: Take d list actors from the 80s and 90s, blend with plenty of women with surgically enhanced bodies, add poorly executed CGI effects of giant mutant animals (or extreme weather phenomenon) edit it together and call it a movie.
Because people keep paying to see them, hence they make money and decide to make another one to make more money.
You have a point, but scary movies make for easy story lines that the producers don't have to work very hard on.