The stronger the villain the better the tale. If villains were all made to be "complicated" and "misunderstood" then we'd all be watching Dr. Phil or Oprah. Those stories are all too much real life. Kids, and adults, want to visit storylands whether in books or in movies, where it is clear who is good and who is bad. Anything else is just documentary. I'm not sure if I've explained accurately what I have rolling around in my mind. Think of the "Star Wars" series, once you learn the connection between Annakin, Luke and Darth Vader, it changes the whole tenor of the tale. It would be as if Ian Fleming gave a Freudian explanation for Blofeld's need to have a cat.