There's two kinds of evil that horror fiction always deals with. One kind is the sort of evil that comes from inside people, like in Dr. Jekyll and Mr. Hyde. The other kind of evil is predestined evil. It falls on you like a stroke of lightning. That's the scary stuff, but, in a way, it's the stuff you don't have to worry about. I gotta worry whether or not I'm getting cavities. I gotta worry about whether cigarettes are giving me cancer. Those are things I can change. Don't give me lightning out of a clear sky. If that hits me I just say, "That's probably the way God meant it to be."
Stephen KingWhen we blew the first atomic bomb at White Sands near the end of the war, nobody knew what was going to happen. There was a theory that the chain reaction would continue forever. And we would have created a little tiny sun out there in the desert that would burn until the end of the universe. It wasn't a widely held theory but it was a theory that nobody had a way of disproving. There were people who thought it wouldn't go off at all, that it would simply sit out there and melt and produce a great big dirty cloud of radioactivity. Nobody knew.
Stephen King