If you insist that strict capitalism has never failed because neither the USA nor any other Western nation has ever practiced pure unadulterated capitalism, then you necessarily have to accept that strict Marxism has never failed either, because neither the USSR nor any other communist nation has ever practiced pure unadulterated Marxism.
If you insist that strict capitalism has never failed because neither the USA nor any other Western nation has ever practiced pure unadulterated capitalism, then you necessarily have to accept that strict Marxism has never failed either, because neither the USSR nor any other communist nation has ever practiced pure unadulterated Marxism.