The class in power is willing to accept the presence of a despised minority, as long as they are kept firmly lower class. It's only when the opppressed agitate for freedom and equality that they all called unpatriotic and unbelonging.
"Since no trouble-free, wartime country has been known to exist, the goals should be tailored to the troubles of the particular enemy, and should aim at increasing real difficulties, building up pre-existing doubts, stimulating genuine internal hostilities. Propaganda which invents pure novelty gets nowhere. The Russians did not hesitate to appeal to Bismarck in order to show the professional German soldiers what a rotter Hitler was, and how stupid the Nazi strategy. But if Bismarck had actually said nothing on the subject of the army in general or an Eastern war in particular, they would have been wise to leave him alone. If the Japanese had tried to make the ex-Confederate States secede all over again, they would not have gotten anywhere because they would not have started with a real grievance. But if they had alleged that the Negro units were used for stevedoring because Whites regarded Negroes as unworthy of carrying weapons, they might have hit on a real grievance. The goal must be deeply bedded in reality."
(The first edition of the book was 1948, and I've found an earlier draft from shortly after the war. Truman started US military integration in 1948 as well. This head start is probably why the US military is better integrated than the civilians it serves.)
https://en.wikipedia.org/wiki/Executive_Order_9981
I wonder if Linebarger had had any particular groups in mind when he wrote:
"If I believed that you were a good enough creature—poor deluded devil—but that you were not fit to vote, scarcely to be trusted with property, not to be trusted as an army officer, and generally subversive and dangerous, you would find it hard to get along with me."
(I don't think it could be women, because the US granted female suffrage very shortly after the soviets)
The Truman Doctrine was March 12, 1947, and that's when containment was announced, signaling the beginning of the Cold War. This film is from 1947.
The War Department wanted unity against Communists, and made this video to try and get people off of other divides. You could be right, could be more high-minded; but I'm guessing this is a "anyone but commies or nazis" sort of ideal.
I think the pleas for racial unity, showing black people going to church in the "freedom of worship" montage etc., were sincere.
Could you explain in what sense you think that the freedom and equality of black people is legally false?