Moral decisions in games?

[Marth]

Did you ever play a game where you were free to make a moral decision? Whether to play for the good side, the bad side, or some other faction? Have you ever actually had trouble going with the bad side due to personal morals?

I have with Bioshock 2, I know it's only a game but I can't bring myself to killing a little sister it just seems heartless and cruel, so I always take the rescue option.

ITT; we discuss moral decisions we made in games.