You know, you could say that Jake and Selfridge are kind of similar, and only differentiate when orders are questioned. They both felt the same comcerning the Na'vi when they first came to Pandora. Over time, Selfridge just took the easy way out while Jake took the harder road. Selfridge was the image of Jake, had Jake been too scared to fight back or care about the predicament the Na'vi were in. It was just a question of bravery, and Selfridge wasn't up to the challenge.
You could almost compare the two to Gandalf and Saruman. One took the hard path; the path of good, while the other took the easy path; the path of evil. Not to say Selfridge was evil, but he was definately on the side of power, rather than the side of righteous act.
Now since Selfridge has had much time to think over what he's done, and how his choices were horribly wrong in most respects, he's going to want to make amends, I think. He's going to want to try and find redemption. What better way than to turn against the corporation he once stood for?
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