Let's also not pretend that the racism of Nazis would have been a problem in most cases in the US of the 40's. (not to mention that Nazi Germany was "inspired" by the US in regards to certain things...)

The same is true for Germans/Germany. While the NSDAP certainly fueled it but core elements of that ideology were common enough within the population, the NSDAP (and Hitler) simply managed to focus all the bad stuff.

The Nazis are sometimes made into these super villains and people are quick to say "x wasn't REALLY a Nazi" but the reality of the time was that it really didn't need much to be in line with Nazi ideology and that didn't require for you to constantly think about industrial scale genocide which is really the thing that sets apart the Nazis/NSDAP from the other reactionary/right wing groups of its time (and even that might have been down to a lack of ability/opportunity and especially scale, not like you can't find at least somewhat similar examples in the time period).