Mao killed way over 30 million. Absolutely incompetent, he manage to remain in power just using terror.
The other day there was an 70th anniversary of the founding of PRC and this criminal's gigantic picture was at the hotspot.
Not trying to defend either of them of course. But just for the record books we would should have a saner way of counting.
If you're going to attribute deaths due to lack of foresight then the inventor of cars probably have one of the highest kill counts. Or Genghis Khan for fathering such a large population of mortals who eventually needs to die.
I think you are overattributing his stupidity here. Engineered famine is a fantastic way to make sure populations that don't like you are less of a problem in the future. The Holdomor and Irish Potato Famine are two other obvious examples.
You kill everyone that doesn't agree with you, along with their family. That's anyone who didn't fight with you either. Let along just against. The 20-45 million that died from famine is in addition to a rough estimate of 30 million killed during and shortly after the revolution. You see the same in Russia too. Oh and in Cambodia. They all actually focused on the "intelligentsia" community first. Cambodia just decided to wipe them all out. Russia and China were big on making double sure they were with the party (not just neutral), before they passed up on killing them. The book 1984 really wasn't accidental in that regard. The more you could think for yourself, the more dangerous you were to the party.
It's not an accident that people are scared to criticize these governments. That's where John Steinbeck really fucked up in his book the Russian Journal. Saying "Oh, do you know anyone that's disappeared because of the soviet regime". If you don't know any Russians (at the time)... I mean, duh, you're probably not going to. But talk to even one dissident against the soviet regime in any of the eastern bloc, they'll give you a list of names of who they personally know.