I think you are right about WWII not being fought for higher ideals. That is the propaganda we got later on. Also, the connection between Nazism and the US is way stronger than you allude to. Ford and other industrialists helped bankroll the Nazi empire. Nazism was very popular in the US back then.

The US were not the good guys by any means. Those same wealthy industrialists lobbied against taking in the Jews when Hitler decided to expel them. They also helped reinforce anti-Jewish sentiment and made sure no one else would take the Jews in.

US companies like IBM gave material support to the Nazi as well. They developed the census system that was used to tattoo Jewish prisoners and then later helped out with the logistical efforts to make sure the optimal amount of Jews could be executed without backing up the trains.

As many people here on Lemmy are found of pointing out it was really Russia that did they heavy lifting of defeating the Nazi. The US showed up to take credit for solving the problem they helped create.