It’s awfully hard to imagine that Mao actually was hoping that people would die, and that they would die en masse of starvation: even if he was strictly self-serving and heartless, he must have known in the back of his mind that huge populations of starving people are unpredictable and difficult to govern. The only way I can picture this taking place is that he (like all dictators) successfully instilled such fear in his direct reports that they never gave him bad news or challenged what he thought sounded like good ideas at the time.