Any system built on the presumption of widespread capacity for reason is bound to fail. The ability for most humans to ‘reason’ is clearly abridged and homoeopathic. And this is before one factors in cognitive deficits and biases. This is separate from sense perception limitations.
Nietzsche was right to separate the masters from the herd, but there are those in both classes with these limited capacities, though in different proportions.
People are predictably irrational
In economics, we have to define reason so narrowly just to create support the barebones argument that humans are rational actors—that given a choice, a person will take the option that leaves them relatively better off—, and even with this definition, we meet disappointment because people are predictably irrational, so they make choices that violates this Utilitarian principle. And it only gets worse when the choices require deeper knowledge or insights.
Democracy is destined to fail
This is why democracy is a destined to fail—it requires deeper knowledge or insights. The common denominator is people, most of whom are fed a steady diet of the superiority of humans over other species and lifeforms and who don’t question the self-serving hubris. They don’t even effectively evaluate their place in the system and their lack of contribution to it.
To the masters, who are aware of the limited abilities of the herd to reason, it seems like hunting fish in a barrel. If we convince the herd that they have some control over their destinies, that’s as far as it needs to go, but among the masters, there are subclasses, so people in these factions are also vying for position, so each employs rhetoric to persuade herd factions.
No one is sheltered from the limitations of reason
To the people out reading and writing blogs and such, confirmation bias notwithstanding, they may more likely to be ‘reasonable’ or able to reason, but try as they may, no one is sheltered from the limitations of reason.
Philosophics 
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