War sucks, I get it.
But the point of a war movie should be to point out the reasons for the war, and why it was a worthy cause to fight the war, especially to those young skulls of mush who don’t know the context of the war.
If I wanted to be educated, I'd watch a documentary or read a book. This was not a documentary.
Most of the people who will see this movie are not young skulls of mush. The main audience will be old, white guys.
The directors said he wanted to "immerse the audience into the experience" of Dunkirk. He was telling a story.