And when you're claiming that FDR and Stalin's administrative styles are similar to any great degree, I'm just going to note that Stalin depended heavily on Lavrenti Beria and on Yezhov before him, and that the Soviet state was a terror-state, dependent on the backhand to control its people. The USA of WWII had segregation and internment camps, but was a democratic society that held elections in the middle of a war.

If there's no NKVD in the WWII USA that in itself immediately makes Rooseveltian USA and Stalinist Russia night and day. They were never similar, and your myopic insistence that they were is the problem. You say that it's not claiming they were identical, but in reality, in my world where words mean what they mean, not what you want them to mean, the claim that Roosevelt and Stalin were similar means that you consider the New Deal equivalent to the Holodomor and the NVKD's murder squads.