And yet he is often rated by scholars as one of the three greatest U.S. Presidents, along with Washington and Lincoln.

...with good reason.
It is a well known historical fact that Imperial Japan had already used Sleeper agents in Indochina... some were there for a 30 or 40 years before that war... gathering intelligence and getting into positions of importance.
Fast forward another 45 years to our 2nd World War and you had potential sleeper agents of 2nd and 3rd generations in our country.

True, but swept up with the relatively few "sleeper cell" agents were thousands of loyal, productive, law-abiding Americans who just happened to be of Japanese (and in several cases, Chinese) descent. "Extreme Vetting" would have been nice here. But on the other side of the coin: internment may have saved hundreds, if not thousands, of Japanese-American lives as the outrage over Japan's attack on Pearl Harbor and its wartime atrocities would probably have led to a lot of murders.

FDR was a Commie who sold the USA down the river at Yalta.

He sold out Eastern Europe at Yalta and guaranteed a half century of murderous stuggle and repression. He sold us out much earlier than that-I would suggest that our future was derailed when his New Deal socialism went into gear, including especially the Keynesian idea that money didn't need to be connected to anything tangible (ie gold and silver) but instead could be tied to the governments themselves and they could spend their way out of financial difficulties (like the Great Depression).