Always Gotta Be Sinister

"Sinister": Alright, I loved the twist from human crimes to supernatural crimes, but come on, why must evil always win. Nowadays, in the movie industry, evil tends to win and there never seems to be a possibility in defeating the evil. Since I love nearly all 80s movies, it seemed that decade was always about the good vs. the bad & the good won, but sometimes temporarily. In this movie, obviously evil wins with no slowing down. However, with a certain tv show that involves the Winchester brothers, evil can almost always be defeated. So in this film, Sam & Dean would have found a way to destroy the evil, why didn't the father do that? HEARING AID OFF