After watching the movie, I came here to read the movie review and found that most of the things have been explained.
I just want to mention one detail: when the Japanese gathering place on the island was discovered by the US military and bloody massacred, many young Japanese were at a loss in despair and cried. And the same expression is not unfamiliar to us - the tears of American soldiers almost run through the entire film.
They are all crying, why is there a need for war? Who needs war?
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