The reaction to a respectfully well done depiction of a historic event by the losers isn't all too surprising.
It's apparent thy're still smarting over their loss.
The communists have a national pride & they're apparently not afraid to show it, or, enforce it.
Aside from the motion picture bugging 'em striking me a bit *odd*, I also couldn't help noticing one other thing.
The communist VN regime's entire -- totalitarian -- approach when compared to present day America, has more than a few stunning similarities.
...the irony of which leaves me speechless.