Most of the men in WW 2 were drafted.

In that case I see no difference between a solder and a civilian. Truman's duty is to American boys who are dying in a war Japan started. He's wasn't the president of Japan

You also have to factor in with any negotiation Japan may of argued they still owned Korea, as they'd had since 1910

In the Battle of the Bulge children were drafted,they magically become disposable war machines.