Good question. I would say it is based on the person, becuase everyone has their own limits to moral flexibility. A true sith would draw the line where ever he /she pleases. Think of it this way, if you had the ability to do anything, absolutely anything, such as kill someone or steal without consequence, wouldn't you be completely free. You don't have to want to kill someone or commit crimes because thats just sadistic, but it's the simple fact knowing there is no limit to what you can do. A true sith aims to achive this power over himself and the universe. Then it becomes his responsibility to draw the line where he sees fit and have others follow until another rises up and achieves a similar power taking his place and establishing a new line if you will. Example: Palpatine was in complete control over the majority of the galaxy and established a new set of laws which were to be followed, the crime of an individual against another would be severly punished. Palpatine set a line for the galaxy he conquered and removed any line(or restriction for himself). Palpatine therefore had complete freedom.