Freedom of speech is also an essential contributor to the American belief in government confined by a system of checks and balances, operating as a restraint on tyranny, corruption and ineptitude. For much of the world’s history, governments, following the impulse described by Justice Holmes, have presumed to play the role of benevolent but firm censor, on the theory that the wise governance of men proceeds from the wise governance of their opinions. But the United States was founded on the more cantankerous revolutionary principles of John Locke, who taught that under the social compact sovereignty always rests with the people, who never surrender their natural right to protest, or even revolt, when the state exceeds the limits of legitimate authority. Speech is thus a means of "people-power," through which the people may ferret out corruption and discourage tyrannical excesses.
Counter-intuitively, influential American voices have also often argued that robust protection of freedom of speech, including speech advocating crime and revolution, actually works to make the country more stable, increasing rather than decreasing our ability to maintain law and order. Again the words of Justice Brandeis in Whitney v. California are especially resonant, with his admonition that the framers of the Constitution "knew that order cannot be secured merely through fear of punishment for its infraction; that it is hazardous to discourage thought, hope and imagination; that fear breeds repression; that repression breeds hate; that hate menaces stable government; that the path of safety lies in the opportunity to discuss freely supposed grievances and proposed remedies; and that the fitting remedy for evil counsels is good ones." If a society as wide-open and pluralistic as America is not to explode from festering tensions and conflicts, there must be valves through which citizens with discontent may blow off steam. In America we have come to accept the wisdom that openness fosters resiliency, that peaceful protest displaces more violence than it triggers, and that free debate dissipates more hate than it stirs.
http://www.lincoln.edu/criminaljustice/hr/Speech.htm
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