Only Possible Plot?
The military returns from Pandora, tails between their legs, but bitter and vengeful. They tell everybody on Earth that the Navi are crazy psychopaths - incapable of reason - and the propaganda machine does just enough to convince those against nuking Pandora to relent.
The military arrives once more at Pandora, this time setting up a perimeter around the planet, whereupon they blast every trace of organic life from the world using WMDs.
The Earthlings strip-mine the entire planet while high-fiving each other.
Is there any other way it could go?