^ Eddington definitely had a mean streak about him. He was just an insufferable jackass who was in it for his own ego. He had such a Jean Valjean complex about him that it colored his whole judgment.
The only explanation I can think of is that he HAD to appear to work to save the crew, otherwise he would have been exposed.
As for "the Maquis aren't evil": Ask the crew of the Malinche.
Or, better yet: Ask the next-of-kin
of the crew of the Bok'Nor