Earlier quoted context omitted.
Rational means you'll make choices that benefit yourself. It's one of the core assumptions of game theory, economics, and policymaking. All the math breaks as soon as that's not the case because irrational is unpredictable. What's nice about rational agency is that it makes cooperation without hierarchy possible so it's been known to rustle the jimmies of the first estate.
> What's nice about rational agency is that it makes cooperation without hierarchy possible And economic liberalism is the belief system that it works for the greater good.
Perhaps also anarchism, due to its focus on having the minimum amount of hierarchy possible.