Friedrich Hayek on how socialism threatens civilization

The demands of socialism are not moral conclusions derived from the traditions that formed the extended order that made civilisation possible.  Rather, they endeavour to overthrow these traditions by a rationally designed moral system whose appeal depends on the instinctual appeal of its promised consequences.  They assume that, since people had been able to generate some system of rules coordinating their efforts, they must also be able to design an even better and more gratifying system.  But if humankind owes its very existence to one particular rule-guided form of conduct of proven effectiveness, it simply does not have the option of choosing another system merely for the sake of the apparent pleasantness of its immediately visible effects.  The dispute between the market order and socialism is no less than a matter of survival.  To follow socialist morality would destroy much of present humankind and impoverish much of the rest.

~ Friedrich Hayek, The Fatal Conceit