It seems to be a recurring pattern, from the first movie all the way to the latests novels and comics that...
"Sith represent a more Tribal society, with cults centered around individual people, personal relationships over institutions, survival over altruism. Sith aren't pure chaos, despite the stereotypes, they aren't evil/darkness incarnate (in most cases). They may mostly be evil, or at least believe in moral relativism and realism, but they are still People like anyone else. They just have more tribal values, tribal organization, and tribal society. They are more "id," the easier and more basic/natural way of living, emotional.
Jedi represent the next stage, a more Civilized society, holding loyalty to ideals over loyalty to people, institutions over personal relationships, altruism over survival. They have not all been guardians of Light, they aren't goodness incarnate, they are not Shiny Happy People Holding Hands in the Age of Aquarius or anything. They may mostly be good, or at least have some universal moral standards and abstract idealism, but they are still People like anyone else. They just have more civilized values, civilized organization, and civilized society. They are more "superego," the more difficult and advanced/artificial way of living, rational.
There seems to be a lot of evidence for this from the movies and the books, and it also seems somehow connected to the other nature/machine tension in Star Wars as well.
The true Sith/Jedi tension is not dark/light or good/evil (since they all depend on your point of view, anyways), it is really the tension between Tribalism and Civilization.
Agree? Disagree? Thoughts/Comments?"
The author of the TOTJO simple and solemn oath, the liturgy book, holy days, the FAQ and the Canon Law. Ordinant of GM Mark and Master Jestor.
