Because they cut the US flag planting scene and then when responding to the hubbub over it the staff and Armstrong's sons said it was more of a moment for humanity as a whole. You dont see why some Americans would be angry? I mean the arms race era wasnt even that long ago and the project was literally an American (and some canadian) effort borne out of nationalism in the first place.

Out of interest, have you actually seen the movie?

Nope. Personally I'm not invested in the moon landing enough to actually pay money to see a movie about it regardless.

But isn't that kind of the point, you are repeating negative apparent negative aspects of something when in the movie they make it very clear that the program was about beating the Soviets and I'd say it presents a very positive picture of the US.

I'm just telling you over what and why Americans were pissed, and that the outcome should've been obvious to the producers. I'm certain most Americans and even most canadians would have seen a negative response to such a decision coming. It's not a part of a negativity culture or complaining or anything, they should've just put the flag planting scene in if they wanted to avoid the negativity.