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The real key to avoiding mass starvations is giving people economic freedom to grow their own food or at a minimum trade for it, as well as democratic means to remove rulers that will starve mass numbers of people.
I'm curious to see this quantified. Mao was certainly terrible, but so was Hitler of course and so were the various famines imposed by British rule.
Here in the US, I'm personally more concerned about a replay of Pol Pot's regime. He took Hitler's warped notions of anti-intellectualism ("Jewish physics") to a whole new level ("Kill anybody wearing glasses.")
The fact that he did so under the standard of leftism doesn't really seem that meaningful or relevant, because if/when it happens here, it will evidently be perpetrated by the extreme right. A pox on both their houses.
Oh look one of you. Hitler didn't get the chance to execute Generalplan Ost.