There's a great concept for the Force that's been developed in the New Jedi Order series. I can't really remember it exactly, so anyone who's read the books feel free to correct me. There really is no "light" or "dark" side of the Force. Everyone has light and dark inside themselves, and the key is finding a balance between these two things--nothing is absolute. It's explained much better in the novels...maybe I should do some research or go back and read tbe books again.