Something I hope everyone remembers is that the american revolution is only the middle part of the game. Like, it is only the second third of the game. Before and after that, our antagonists are probably going to be mainly colonist-based. The revolution brings in the British redcoats, and they will probably be villains a lot of the time they are in the story, because they are a major giant attacking force against a smaller one. Can you really spin that into them being the sympathetic side? Anyways, the reason we've been seeing them being killed most is because the game is being marketed as being set in the revolution. And they're purposefully only showing scenes from the revolution, because that doesn't give anything away about the story before and after.
Alex said that we have not seen any video or screens of anything from the first 3 hours of the game. You know, the part where the soon-to-be americans DESTROY CONNER'S VILLAGE?
Yeah the game that starts off with american oppression of natives is definitely pure propoganda.