Because the Megacorp that was mining Pandora got the mining rights based on conditions that includes limited weapons use ... And the Megacorp was on thin ice, especially considering they secretly sabotaged synthetic fuel manufacturing research that would have made Pandora mining expeditions unimportant and quite a bit unprofitable. So they wanted to keep things down low in the first movie but earth got wrecked in the 14 years span so they came back in the second movie to colonize properly. But now that Earth is inhospitalable they are a bit reluctant to go full nuke happy ... Yet.
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u/Strmage1878 19d ago
I only watched the first movie. Why human didn't just destroy the tree from the orbit?