It's silly to compare novels to textbooks and encyclopedias. And if you are, then it seems like you're quite in favor of revisionist history, since those kinds of books are frequently revised, and for good reason. But to say that one branch of fiction is free to be edited and re-edited while you bitch and complain about another branch of fiction being edited and re-edited just makes you sound wishy-washy. It's all the same thing. And like Obi Jeewhyen and I have already said, Tolkien had already covered his bases by saying that The Hobbit was Bilbo's lie. To change The Hobbit after that was counter-productive to that plan and is very much in line with Lucas's idiotic changes, in my opinion.