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If man's "greed" and moral infallibility are such deep-rooted problems in the collective consciousness of men -- particularly men in power -- why then support a centralized hierarchy of power with a monopoly on violence called government? Why make it easier for such power-hungry men to solicit the State to its will (e.g., big business padding the coffers of bureaucrats in return for favors or State-granted monopolies); or even so much as entertain the thought that any of these greed-driven men may assume command of its legislators to wield absolute power over the citizenry?
The free market is the only "system" which can guarantee that power can never be amassed in such quantities as it has been by the State. The free market is a necessarily decentralized process (a process more than it is a system), and through this the "greed" and "profit-seeking" motives of entrepreneurs serve, instead of their own interests, all the interests of the people their endeavors seek to serve. Ludwig von Mises in his magnum opus /Human Action/ wrote, "The market economy is the social system of the division of labor under private ownership of the means of production. Everybody acts on his own behalf; but everybodys actions aim at the satisfaction of other peoples needs as well as at the satisfaction of his own. Everybody in acting serves his fellow citizens."
Indeed, if man is such a fickle, heartless soul as you lay claim to, it is really just one more black mark against the existence of State, and an argument for an absolute free market. The State, after all, is made up of people: the same as you and me: prone to the same corruption you speak against.
Caution Wake Turbulence