The whole war thing of Avatar was based on the human greed for unobtainium that is found in large scale on Pandora.
Now Dr. Grace had a wonderful knowledge on the biological structure of Pandora. But none listened to her and Pandora was attacked. In the whole film it was shown Parker Selfridge as the administrator of the program. But what kind of administrator was he that neither he ever listened nor he tried to understand what kind of biological treasure was on Pandora?
One more thing to be noticed nobody from Earth ever asked for what is going on Pandora for a particular time? I mean no feedback form the human base camp on Pandora at all to the earth where the sponsors and govt were there!
Shouldn't there have been another supervisor from the Earth whom Grace could report to what is going on Pandora and how Parker was going to destroy Pandora?
If she did, nothing should have happened! Watching the whole movie, sometimes it seems the mission was a reckless driving by a stubborn driver like Parker and no body was there to pull him. Dr. Grace could report to earth about the misleading by Parker there.