Although I like a bit of darkness in any RPG, the is a dark side to every soul and thus to every story. I do not play D&D to have a But this is not why I play D&D. I play D&D for heroic fantasy. If I want horror roleplaying I turn to White Wolf games or Call of Cthulu.
I don't agree that roleplaying an 'evil' character degrades your morality in RL. In a Werewolf game I play a character who is, to put it plainlym a racist bastard. I was initially rather shocked at how easy it was to get into this character. In the end it only made me more alert to the fact that racism and prejudice in general can pop up very easily. I learned a valuable lesson playing this character.
I don't agree that roleplaying an 'evil' character degrades your morality in RL. In a Werewolf game I play a character who is, to put it plainlym a racist bastard. I was initially rather shocked at how easy it was to get into this character. In the end it only made me more alert to the fact that racism and prejudice in general can pop up very easily. I learned a valuable lesson playing this character.