Hundreds of millions people died from flawed government polcies or natual disasters throughout the human history, but the west only says that Mao "killed" the Chinese population even with the clear evidence that people died from some wrong economic policies and natural disasters, those policies were designed to boost and help the Chinese nation and people, like the Great Leap Forward, but those policies backfired and indeed caused some adverse effects on China, they were quickly scrapped once proved wrong.
China's open up and reform policy which brought China this great prosperity and wealth was also a new policy trial, in essence , it was the same as the Great Leap Forward trial, the only difference is this policy trial has been proved a great success, Chinese government never stops trying news ways to boost the country and getting the population rich, there were and will be setbacks in this process but China won't stop, otherwise we won't be at where we are now today.
Hitler killed millions of Jews with the sole intention of killing them, not helping them, that's the definition of killing, the west for decades keeps equating Mao's development experiments with Hitlers's genocide, that only shows howe evil minded they are about China and only people with brain size as a bird will fall for this vicious anti China propaganda.