It is my principle that it is inevitable to sin. We all most commit sin at one point in our lives. To experience the fruit so to speak. You can't have purity, or goodness without sin. Why is it that so many people strive to reach there heaven? The answer to me is quite simple, it's because of hell. Or at least the fabrication of a hell. Without one you can't have the other. There is always an opposite. It's a balance; look around, you'll see it's true with every thing.