> Why is that only a problem for democracy?
Because democracy at least pretends to give power to the people. Except letting a few individuals wield enough wealth and power to buy media, politicians and judges is completely antagonistic to the basic ideals of democracy, and not many realize this (yet).
> I’m not aware of any system that [...]
Liberal democracy is better than feudalism, I see no reason why our systems of governance can't be improved further. And, at least to me, the obvious path forward is to keep any of those "deranged dark triad personalities" from gaining too much power, maybe by limiting the amount of wealth any single individual can hold unto.
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> It took a disease killing a massive portion of the working population to weaken feudalism in Western Europe.
Erm... sure, but I don't see what that has to do with my comment? Transitions between political systems are rarely pleasant and are usually motivated by crisis.
> And don’t underestimate the portion of population that yearn to be peasants.
I don't buy that. People learn submission, it is not inherent to the human mind.