Are they scruffy looking and related to nerfherders?
The so-called Dark Jedi I can understand. Like us, they don't accept the fact that something might be off limits to explore. Take a dab in the "darkness" of the true will of the force which grows stronger with your emotions. If all Jedi believe that "no one can be more and no one should be less", then why do they have the Jedi Council of masters? Those select few, the strongest of the Jedi, place themselves above other Jedi, herd the other Jedi sheep, and yet claim they are keepers of peace.
And what is up with Revan? What horrid machine was used to brainwash him of his true feelings? Personally I gave his mask back to the lady in the Revanite camp on Drommund Kaas, hoping that she would see to it to teach the true power.