I found the scientists to be loathsome ingrates...
Jake shows up due to contrived circumstances and all kinds of things happen to push him to do a lot of the things he did.
But Sigourney Weaver's character and the other scientists seemed like ignorant ungrateful fools. She agrees to come to the planet because the company wants to make a peaceful solution, then the Na'vi attack their resources and she gets upset when they respond. They had over 10 years and several final warnings to help make a deal and she did nothing but act superior and outraged that the company needed to remove them from the place where most of the mineral that allowed her and future humans to come there was.
The only reason the scientists were able to go to the planet is because of the mineral and the technology and actions of the evil corporation in charge. So why work for them in the first place if you are so opposed to their efforts to remain in business and save your planet?