I legitimately don't understand your point? What?

Communism hasn't prevented fascism from rising, that's why communism bad?

The Nazis would likely have never rose to power in Germany had the social democrats not betrayed the revolution to preserve capitalism, btw.

I'm not sure what point you are trying to make here. The American empire sat back and let the USSR and the Chinese communists take the vast majority of casualties to defeat those rival empires then made them into imperial vassals?