As someone who has read a lot about the story of pocahontas and captain smith,and the discovery of america ; i think the avatar is a more idealized version of that story. You know indian people couldn't survive the war, they even didn't fight they just prayed to their ancestors and wished not to be attacked as far as i know, they were all friendly and patient and tried to talk it over. Maybe because they were hopeless, the immigrants were not as crowded as indians were at first but they were much more ahead of them in terms of technology. Yet the creatures of the pandora planet are not also religious but also they are offensive when they're attacked. They keep fighting and don't meet their fate calmly. Of course there are many differences too.
The movie made me think that we always assume the aliens as more developed and powerful creatures then us. The Avatar looks like a "what if?" movie to me, the planet is not that developed, they don't know any guns but arrows, but i see they're more civilized than the usual people. They don't deserve what they don't deserve, they don't invide they just defend themselves. I think this movie is something that should remind us what is important. To develop and invent a lot, or to stay civilized and don't forget we're all siblings? Doesn't it remind us how ambitious we- all people- are?
I find it utopic. It's something more like getting back to the ancestors to me.