"Evil", at least in the SW universe, is not merely the absence of good. Instead, it requires an active malevolence on the part of the Force user (or the non-Force-user - Han Solo, prior to meeting up with Luke and Obi-wan, was not "good", but neither was he "evil"; in the words of Gag Halfrunt, Zaphod Beeblebrox's private brain-care specialist, "He's just zis guy, you know?")
Similarly, Jolee Bindo wasn't evil, he was just grumpy and figured the universe could really get along just fine without any Jedi (or Sith) at all. And Kreia had, as I noted, been at both extremes, neither of which had brought her either peace or sufficient power to dominate all. She was cynical, but not evil, as such (Sion had referred to her "teachings that weaken us"). I think she mostly wanted to make sure that as the Exile came back into his/her power, he/she didn't become a stuck-up self-absorbed prig, like most Jedi of the era.
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Sodium is a metal that reacts explosively when exposed to water. Chlorine is a gas that'll kill you dead in moments. Together they make my fries taste good.