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because corrupt individuals will eventually gain control of the government and limit citizen liberty in order to gain advantage for themselves.
because a citizen will eventually challenge an action of the government causing the government to suppress that challenge by limiting that citizen's liberty.
because an action of that government will limit citizen liberty and the government will have acquired sufficient power to enforce the limit to liberty.
because poorly worded laws will eventually be used in unintended ways to limit citizen liberty.
Every government has a limit to it's power due to the ability of it's citizens to revolutionize.
The purpose of a government is in some way to limit its citizens' liberties, for instance the liberty to murder or steal.