What was under the dirt in Vietnam? I think your hands may be clean in that aspect at least. WW2, Korea and Vietnam may be clean in that respect, they weren't resource grabs. I think one of the reasons Avatar is so popular is that it is FULL of HOOKS, there are all sorts of aspects of the storyline to pull people in. James Cameron my have done that deliberatly, or it just worked out that way.
I think it is placed in the aliens universe with the megacorp and gov closely linked. It comments on the theft of resources from aboriginal peoples. It links into the "Greenness" thing. There is a ceratain amount of romance going on. Medical/druginess is involved, tripping to artificial bodies and the flying scenes. The Disabled are given a good dream. Then there is the good old violence of a final battle. Heck there are tie ins to some of the Gamer culture, and Pop culturee with the return of at least 2 or 3 of the aliens crew, the floating mountains.
I think that this movie is the ultimate in velcro media.