Indeed it is surprising, but I think it's because communism wasn't put on trial when the Soviet Union collapsed. There weren't courts punishing gulag wardens and KGB officers for torture, murder, and everything else under the sun. Everything was forgiven for the sake of peace, but everyone learned the wrong lesson. Which is why when "nationalism" is mentioned, people think of Nazi germany, but when "socialism" is mentioned, today's youth especially wants to think of Sweden. The crimes of Nazi Germany are regularly mentioned in popular culture, but those of Communists not so much, though they're more contemporary, lasted much longer, and arguably affected a lot more people.

China is currently butchering Uyghurs.

That people in the US espouse Marxist beliefs while a Marxist state commits genocide is “the same” as when parts of American society supported Nazis.

Disney thanking China for their help filming Mulan next to a camp is the same simpering we saw from corporations supporting the Nazi regime.