You might want to read a bit more carefully, Stacy. Kaplan didn’t call a Burma invasion a simple moral decision — he wrote “It seems like a simple moral decision,” and then explained why it shouldn’t be taken lightly.
Really, is even discussing the possibility of a military action out of bounds to the Losers for Peace crowd? (By the way, the suggestion that there was nothing remotely pro-Nazi about the America First Committee is preposterous. It was a diverse group, but it absolutely did include some hardcore anti-Semites and Hitler apologists.)