I think every single Sith other than Palpatine is a freak in some way or the other... they are deformed, rabidly crazy, consumed with lust for power or revenge, or some other negative that an author can concieve to divorce them from their humanity. That's funny, because on that front I am the exact opposite from you. Because Palpy himself tells us, in RotS, that one of the things he detests most about the Jedi Order is that they take personal choice over the course of their own lives away from Force-users at a very young age, and because over 1000 years we're talking at least 50 Sith masters, all powerful, all headstrong, and none of whom had anyone who could make them do or not do anything, I tend to think of the Sith Order as a jumble of individuals with their own takes on their own missions in life. I'm sure there were some real Warrior Sith, who were as murderous as Darth Bane, but I'm sure that there may have been at least a few "Scholar Sith," who were content to study the Dark Side of the Force and leave the Jedi alone as long as the Jedi left them alone. Palpatine, on the other hand. *sighs* Palpatine, Palpatine, Palpatine. Anyone who can long his whole life for the chance to fulfill his dream by winning high public office, only to murder the very people who lay that chance in his hands, has a serious defect in his conscience. I think Palpatine is probably the most, not the least, criminal-minded of the Sith. However, barring a biochemical organic brain disorder, I do believe that anyone has the potential to change ... anyone including Palpatine. What's usually required for the change, however, is that that person hit real rock bottom, as far down as they can possibly go, as horrible and hellacious as things can possibly get for them, as a result of what they've been doing. When things get that terrible, a person may (not necessarily will, but may) develop the capacity to say, "I cannot stand this any more. I will do anything for this experience to end." And at THAT point, the person is ready to consider change.