The character types:
Are we to believe that our ancient environment was at its most harsh in the absence of Europeans? Are we to believe that pre-contact North America was so untamed that even the seasons were inconsistent, and that today's global-warming weather is "normal?" Of course not, but "Pathfinder" may convince some that Native America was ruled by nature, and in need of a good European environmental makeover.
Is this common ancestor the sole reason why the French, Spanish, English and, later, the Americans were met with such violent resistance from Native warriors? Are we to believe that our ancestors could not produce the warriors and warrior societies that protected our people against the gun-wielding brutes of Europe without the teachings of a Viking? Of course not, but "Pathfinder" may convince some, and vindicate others, that the strongest and bravest warriors came from Europe and that somehow our ancestors were bred into knowing their warrior ways.
Contrast this with the depiction of Native America in Disney's Pocahontas. There the land is the opposite: a colorful, magical place of talking trees and lovable animals. This also sends a stereotypical message: that Indians were happy-go-lucky nature lovers compared to the cruel, exploitative Europeans.