“The US” was very much in love? NO, a lot of Americans were. But the US was NOT in love with the Nazi party. And if you mean, “when Americans realized how horrible the Nazi’s were”, instead of “politically inexpedient”, then maybe I can agree with you.
The Nazi party’s racist ideology was based off of the Eugenics movement that started in the US. Fascism has a bit of history in the US as well, besides the NYC Nazi rally.
Mussolini seemed to think that FDR was the same as him: https://italoamericano.org/the-italian-connection-roosevelt-mussolini/