[Warning, spoilers from 1st Chronicles Herein]
First of all, the terms good and evil are both relative and subjective, and depend entirely on who is doing the judging. We should ask for a specific definition every time somebody uses either term. How tedious would that be? I think that for most people, the continuum of good vs. evil changes each time the person gains a new experience. It's like asking somebody "What is happiness?" and expecting a 20-words-or-less answer that everyone can agree on.
As to whether actions or people are or can be evil, I would say it depends on who they are, what actions are in question, and the value system of the person passing judgement.
Kevin Landwaster's Ritual of Desecration wrought great evil upon the Land. The act in and of itself is described as evil, but from Kevin's point of view, he thought it was the only way to get rid of the Despiser. Lord Foul is the personification of evil, and the one that was hoping for the RoD, but it was Kevin that did it. Are they both evil? Or is one evil and the other just tragically misguided? Was the act evil? I say Yes, because it was done out of despair. But, from Kevin's assumed PoV, it was done for the right reason--to rid the Land of Lord Foul. What he didn't realize is that it wouldn't work, at least not until it was too late. Whether he himself is named evil is all about how harshly you judge him.
Elena thought she was doing the right thing by bringing Kevin back, and obviously didn't think it through--breaking the Law of Death was a huge victory for Despite, though that was a totally unintended consequence of her action. It caused massive harm to the Land that she loved, though she was only trying to help defeat Foul. Was she evil? Was she tainted from the beginning because she was born of rape? Or was it only her act that had unintentionally evil consequences, because she was either insane, foolish, or misguided (or all three)? It's again all about how harshly you want to judge her.
You could say that Lord Foul is evil, but what would a Raver say about his boss if you interviewed him? Do Ravers think of the Despiser as evil incarnate? Or do they merely see themselves as locked in a struggle against hated enemies [all living things]? There it's all about point of view.
We can go on like this for pages and pages, but unless we all suddenly decide to accept the same value system, religion, and level of social responsibility then I don't think we'll ever agree on what evil is, because "well, it depends..."
In the mean time, we can sure have some fun discussing it, though
