actually, I suppose one has to define what dichotomy they're talking about, the rebels vrs the empire is admittedly good vrs. evil, but if one gets into the sith/jedi thing, the sith are, at their base, chaotic, not evil, and the jedi are, at their base, lawful, not good. Now, granted, every sith shown in the movies has been evil both for metaplot reasons and because I will admit that being chaotic does, probably, very quickly lead to being evil because you're more willing to commit questionable acts in pursuit of your goal, and probably every jedi shown in the movies has been good, but really what the jedi philosophy shows is a philosophy of law, not good, just like the sith philosophy is a philosophy of chaos, not evil. However this also stands on the stupid core D&D assumption that l/c is emotionless/emotion based.
Evil does not often call itself evil.
But the expressions that are key here are:
1) Killing people with the force is the dark side. Indicating that a moral choice is important to some agency.
2) Giving into anger and hate are the dark side. Again both moral choices.