Darkness or Light? Philosophy in Knights of the Old Republic.

This is one of the main tenets of the Sith. Hmm, you wouldn't make a good Jedi...

Well, I used to think differently. But now... Why live for others? (The exception is only close people).
And there's an inconsistency:

freedom, personal choice

But what about the Sith Lord? Shouldn't the rest of the "small fry" (Sith) obey him?