Two words: Manifest Destiny. American capitalists were using the US military as mercenaries to slaughter natives long before Hollywood started making movies.
What was Dances with Wolves about?
Irrelevant.
Dances With Wolves was about past sins that were real.
Dances With Smurfs takes things people do that are good and right and make them out to be sins. Moreover, the political point of view it pushes doesn’t just want those good things stopped, but wants to enslave people.