@seungjin, political systems survives by satisfying the majority (or rather, not driving them to desperation) so they don't overthrow the ruling class. Humen are social animals, driven by their, for the lack of a better word, moral system, e.g. fairness, care, loyalty, authority, etc. These are evolutionary traits and don't necessarily reflect what is required for societies of the current scale (which only exists for some thousand years) to thrive or survive. Improvements in the overall life quality thanks to advancements are only a side effect of a long lasting civilization IMHO.