How do you respond when people bring up Mao Zedong killing sparrows and causing a famine that killed "millions"?

Fascist Authoritarianism is a form of government and communism is an economic system, communism has been used as a carrot dangle by corrupt fascist authoritarian governments many times but has nothing to do with communism itself, and even so fascist capitalism has caused way more far reaching harm than fascist communism has