Have you ever seen that old movie called "Vanished" or something like that? There was this guy who rescued a woman and saved her life somehow, then felt uncomfortable with all the feelings of heroism and goodness that filled up inside him. To compensate for these feelings, he decided to start kidnapping women and burying them alive.
Anyway, Lucas seems to be doing the same thing here. He created (apparently on accident) a trio of wonderful films, and now he's trying to throw away his hero status by not only introducing horrible prequels, but butchering the classics and selling them to kids who never grew up on them and don't know the difference. He just doesn't feel comfortable knowing he did so much good, and needs to balance it out with some evil. Or idiocy, at the very least.