Can you name the greatest mass murderer of the 20th century? No, it wasn’t Hitler or Stalin. It was Mao Zedong.
According to the authoritative “Black Book of Communism,” an estimated 65 million Chinese died as a result of Mao’s repeated, merciless attempts to create a new “socialist” China. Anyone who got in his way was done away with -- by execution, imprisonment or forced famine.Source
Imagine a conservative politician had approvingly quoted Mein Kampf. What kind of reaction would that get? But leftists quote their mass murderers and that's OK because even though they butchered millions, they did it with the best of intentions.