They aren't. Exar Kun wasn't, neither was Tulak Hord, Naga Sadow, Ajunta Pall or Marka Ragnos.
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Exar Kun was an idiot Jedi that went dark-ish...his story is a little ridiculous actually. Basically he got lured in to a cave and a ghost wouldn't let him leave until he turned evil then shenanigans and eventually he's betrayed by his pupil and destroyed...as a ghost which shouldn't even be able to happen. That's the very short version. You should google him. It's worth reading his wiki page.
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I know the story of Exar Kun. What makes you think I don't?
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I dunno...I was more placing that comment there for those that didn't...sorry. ¯\_(ツ)_/ ¯
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No problem I was just curious