And that is precisely the problem. "Moral ambiguity" was little more than Hollywood double-speak for "we don't want to be pro-America" and never mind if that means tampering with the source material. The idea that this "had" to be this way is nonsense. Of course this film didn't even get attitudes about WW1 right since I didn't hear a single person utter the phrase "war to end all wars" or "make the world safe for democracy" or the name "Woodrow Wilson" and his "Fourteen Points." WW1 emerged long-term as a giant mistake but most people who fought it at the time didn't see it as such.