Jonah, you nonetheless raise another important point: There were serious ideological differences between German Nazism, Italian Fascism and Japanese Militarism. But they were all enemies of freedom and of the democratic experiment; and they made common cause against the Allies – meaning the U.S. and the UK after the fall of Czechoslovakia, Poland, France, etc..
Soviet Communism allied with the US and the UK only after Hitler’s National Socialist regime turned on Stalin’s brand of socialism. But after the defeat of Germany, it quickly became apparent – to conservatives and to some liberals, as well – that the USSR was an intrinsically hostile regime motivated by a poisonous ideology.
The lessons for the current global conflict should be obvious, but evidently they are not, or at least they are not to everyone.