It really has to do with learning. Children teach you compassion. They teach you to love unconditionally. Anakin can’t be redeemed for all the pain and suffering he’s caused. He doesn’t right the wrongs, but he stops the horror. The end of the saga is simply Anakin saying, I care about this person [Luke], regardless of what it means to me. I will throw away everything that I have, everything that I’ve grown to love – primarily the Emperor – and throw away my life, to save this person. And I’m doing it because he has faith in me; he loves me despite all the horrible things I’ve done. I broke his mother’s heart, but he still cares about me, and I can’t let that die. Anakin is very different in the end. The thing of it is: the prophecy was right. Anakin was the chosen one, and he does bring balance to the Force. He takes the ounce of good still left in him and destroys the Emperor out of compassion for his son.
George Lucas – The Making of Revenge of the Sith; page 221. (via greenkaorichan)