There is nothing corny at all about positive thinking. Its too bad people must figure that out for themselves. I like to think of the Devil as the embodiment of the negative-thinking meme. Call it chaos, reality, evil--whatever. Anyone can sit around providing proof there's no such thing as good or evil until the cows come home, but at the end of the day--someone has to know that evil is alive and well.
Let me put it to you this way. Sometimes things happen between us we'd rather not, such as disputes among family members and loved ones. We can choose to let fate work it out---stay out of it and let the gears of the reeling cosmos execute whatever justice it will. Sometimes I think that must be tempting to a lot of us. It is my belief that if we do that--then any of a billion equally terrifying fates potentially, and quite randomly, await us. I'd rather not place myself on the yawning altar of space as a piece of bait, like that.
Instead, I choose to wield some form of human moral code and interlock my shield with fellow soldiers to direct Hell itself (negative-thinking meme-pool) away from us--to re-direct its course--in another direction. To decant it back into the vacuum it came from. I believe if we do nothing, the dark side of the wild will seize the chance to take root---using our blood for its fertile soil--and our bodies as the clay pots.