But for argument's sake... Even if people (as in, most people) are irrational, that wouldn't necessarily lead to their rulers being irrational, would it? After all, we supposedly* select people who are good at ruling to be rulers, just like we supposedly select people who are good at healing people to be doctors. They are expected to be better at it because they are interested in it, have studied it and are focused to do it, not because they're supermen.

* yes, this could be tad optimistic, especially under democracy because of the very irrationality of most people