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This point could be made on every ideology.. Capitalism in essence is pretty gruesome too. The enlightenment, american and french revolutions and the labor movement was stuff that moved the pin in the right direction.
Marx builds on Smith. Would you agree then that Adam Smith is disproven even more and responsible for far more starvation? That would be ridiculous.
There’s communism the theoretical idea and “communism” the application.
The twentieth century was neither, but just authoritarianism wearing a trench-coat.
What part of Marx's work do you think has been disproven?