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The "monster" is a fundamental problem with violent revolutions. Can't speak about Maoism but the need for violent revolution was the distinguishing feature of Marxism and then even more so of Leninism and Stalinism.
In short, the violent revolution results in negative selection by eradicating reasonable supporters and promoting those ready for indiscriminate violence.
Bertrand Russell perfectly noted that among Bolsheviks already in 1920: