10. The "good" side of the "good war," the party that did most of the killing and dying for the winning side, was the communist Soviet Union. That doesn't make the war a triumph for communism, but it does tarnish the tales of triumph for "democracy."
11. World War II still hasn't ended. Ordinary people in the United States didn't have their incomes taxed until World War II and that's never stopped. It was supposed to be temporary. The bases have never closed. The troops have never left Germany or Japan. There are over 100,000 U.S. and British bombs still in the ground in Germany, still killing.
12. Going back 75 years to a nuclear-free, colonial, world of completely different structures, laws, and habits to justify what has been the greatest expense of the United States in each of the years since is a bizarre feat of self-deception that isn't attempted in the justification of any lesser enterprise. Assume I've got numbers 1 through 11 totally wrong, and you've still got to explain how the world of the early 1940s justifies dumping into 2017 wars funding that could have fed, clothed, cured, and environmentally protected the earth.