Sith != Evil

There is a common misconception that the Sith access the Force through evil or that being a Sith Lord automatically means that you are evil. This is not true. Any extreme emotion can access the Force. The essence of the Sith's power is in passion, not evil. Passion can take the form of joy or love as well as anger or hatred. Sith are typically evil in that they are often blinded by their passion or corrupted by the power granted to them by the Force.

- How Stuff Works article on Sith.



Very interesting. Very very interesting.