Obviousology 101. The least that people arguing for the utilitarianism of World War 2 could do is get the analysis right, that FDR was a communist agent trying to destroy the regional buffers against the USSR and Communist China, nothing more, nothing less. If you are going to intervene in interstate affairs, you go by the rule of at any given point aiding the side that appears to be losing. Had that been done imagine how much better the map of Eurasia would have looked, not just a big Red blob.