But seriously, why didn't communism triumph in the 20th century when things were looking so good? If the russian revolution and chinese revolution can succeed, liberating 800 million people, 1/3rd of the world's population, defeat the nazis, why couldnt we finish the final stretch? What was the fatal flaw?
my understanding is the economic stagnation which lead to leaders like gorbachev implementing free market liberalization which - along w the somewhat flawed implementation of state enterprise markets - lead to the development of material conditions that gave the bourgeois enough resources to push the counterrevolution far enough to break apart the Soviet Union, even if the dissolution was unlawful. (also a sidenote but the emphasis on heavy industry slowing the implementation of cybersyn before the fall of the ussr will always be a shame and interesting thought experiment)
even in the most 1984 gorge orwel societies reactionary forces w material support from the bourgeois within and capitalist forces from outside will always have the potential to attempt counterrevolutions, the question as another user put it is who is there to defend the revolution.