Oh, please.
That's such an unsubstantiated response. Yes, I am a rational person and I am a straight thinker, but I have emotions too. I don't impose that value onto others, and I don't assume everyone is like that. Here is what I believe: everyone has their own values, and it is reflected in how they act. Some of these actions are actions in the marketplace, where they demand goods and services in accordance to their own individual preferences, not mine.
Never do I (or economic analysis in general) assume a homogenous, pure-thinking population. Emotions and idiosyncracies are perfectly compatible with economic analysis. This can be seen from one of the most basic principles of economics: the demand curve - it is not a flat line because everyone is willing to pay different values, because everyone has different preferences.
Dare I say it, Mao (and everyone else) is actually rational, whether he believes it or not. It is an inescapable definition, because rational behaviour is behaviour that is based on your personal values - and there are no restrictions on those, not in economics, and not in my mind. Clearly, those who believe economics assumes humans are robotic (rational, emotionless and all the same) simply misunderstand economics.