I've been playing Knights of the Old Republic making all the most evil choices possible. Like you do. Written up in three parts, the final chapter of Simon Evil's wrongdoings has now appeared on Eurogamer. You can read parts one and two by clicking on these cleverly placed links. Here's an excerpt:
"It's interesting how picking the evil choice that destroys a woman's life, or kills an innocent, or sees families slaughter each other, has a very different emotional effect than aiding the enslavement of an innocent tribal race. All are obviously deeply evil, but I think I'm able to compartmentalise the more individual actions more easily, mentally filing them under "terrible thing I did in a game". Even though polluting the Kolto would have devastating effects across the entire galaxy, I think it's still pretend enough to laugh off. Oppression struck deeper. I was still delighting in making the evil choices, but here on Kashyyyk I was feeling those familiar pangs from the first third of the game again."