I could understand this if "America" was a singular entity. In reality, it's much more complicated than that. It's American filmmakers creating a movie about how a war, which American politicians chose to fight, effected American soldiers.

Attributing the collective actions of every single person from the US to a single entity called "America" and then pointing out that these actions are inconsistent is a silly reductionist argument.

Edit: I should also add that I strongly think the world would be better if the filmmakers were creating movies about the effects of war on the _other_ side, not just their country's side.