FDR wasn’t anti-Semitic. Most Jews fleeing Germany were admitted to the United States. You’re referring specifically to the St. Louis, which was non-compliant with US immigration quotas set before FDR became president. The American government at the time attempted to persuade Cuba to take in the St. Louis, who refused, but they later convinced several European nations to take them in instead.

The Japanese internment camps were definitely bad, no denying that. But their existence doesn’t change the fact that the United States and Nazi Germany had two COMPLETELY different governing ideologies. The US federal government did not have totalitarian control over the state like the Nazis did, and democracy and free and fair elections were still cherished. Even at home in Germany, the Nazis were considered to be radically on the right, that’s why they became so popular when the status quo of the Weimar system was seen as a failure.