SemperJase said:
Now you are back to moral relativism.
I'll keep it simple. It is unhealthy for a player to play characters of evil alignment.
This is exactly my point. Morals are inheritly relatvistic. I'm not using any of my own definitions, I'm using yours. You said that if you had a character who believed he was doing evil, you thought that his player was doing himself harm.
I'm pointing out that there are plenty of characters (and people) who do really heinous things but think they're doing good. Ku Klux Klan members, men who beat their wives, Lou Perlemen and The Backstreet Boys. These are all people guilty of horrific crimes against humanity, but they all think what they're doing is not only okay, but the morally perfect thing to do.
So I put it to you again. Which of these characters is going to hurt me morally?
1) An elvish rogue who's basically a heroine, but she steals everything she really likes.
2) Same character, except she also engages in promiscuous, dangerous sex with unsavory characters (because she's selfish and thoughtless)?
3) Same character, except when she kills her enemies, she finds to her horror, she likes it? She fights mightly against this impulse but it's there nonetheless?
4) Same character, except she feels unrepentant about getting joy at killing hobgoblins, because they killed her entire family?
5) Same character, except she takes unrepentant joy in murdering anyone who gets in her way, and feels it's right, because she can, and therefore she should (might makes right)?
And so on. At some point a character goes from "good" to "bad". The problem is that in your mind, at some point, I am harming myself morally by playing this character. At what point does this occur?
Again, this is the inherit flaw in your perspective. There is no absolute line after which a person is damned forever, or after which the player of that character is undeniably hurting himself.
You previously said, "When the character thinks they're doing evil," but every example I gave above the character doesn't think they're doing evil.