All of that would require accepting that having communism as the end goal has caused death and oppression similar, if not worse then, the Nazis.
And they’ll never admit that. Because if they do, then they open the door for criticism of any current “communism” like China. And we’re not allowed to talk about the genocides that China is responsible for. If China’s flags were green and they used a tractor instead of a hammer and sickle then there would be anough cognitive dissonance to allow for criticism of past regimes while pretending that you’re not doing the same thing now. But it’s too late. That iconography is now representing China, so they must defend the sanctity of those icons. It’s a lot like religion. Or a cult.