There was a widespread appreciation for Hitler and fascism within the capitalist world. There was even a pusch to bring fascism to the US after FDR was elected that failed only because the conspirators involved a marine general who wasn’t a traitor and exposed them all. Fascism has a lot in common with the preceding capitalist system. Hitler did not invent concentration camps or death camps or genocide or antisemitism or racism or poison gas or anticommunism. There was an American Nazi party with membership in high places, including Hollywood. A censor from the Third Reich was invited to keep anti fascism out of US movies. Of course in the communist world Hitler specifically and fascism in general were considered an existential threat to communism. Hitler was very explicit about seeing communism as the enemy of the German people as much as the Jews. Stalin tried to get Churchill and Roosevelt to see this, to no avail. Churchill had after all invaded the USSR after WWI to “strangle the baby socialism in the cradle.” Not only was Churchill an imperialist who personally gassed indigenous peoples as part of his service to the empire, and spoke glowingly of Hitler and wished his own country would get a leader like that, he only ended up fighting Hitler to save the British Empire. Before The Molotov-Ribbentrop Pact, Churchill was happy to use Hitler as his agent to destroy communism. Stalin knew this; that’s why he went from avid anti fascist to a treaty with fascism that put more distance between Moscow and German fascism by devouring Poland (and also putting down the Polish fascist movement). FDR’s feelings toward communism are less explicit but his VP for 3 out of 4 terms wanted to work with Stalin to decolonize the world, and FDR himself started calling him “Uncle Joe Stalin,” though whether that was to appease US anti communists uneasy with the alliance with the USSR is an open question.