"If there is an ‘overabundance’ of an idea in the absence of direct governmental action - which there well might be when compared with some ideal state of public debate - then action disfavoring that idea might ‘un-skew,’ rather than skew, public discourse."

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As a matter of constitutional tradition, in the absence of evidence to the contrary, we presume that governmental regulation of the content of speech is more likely to interfere with the free exchange of ideas than to encourage it. The interest in encouraging freedom of expression in a democratic society outweighs any theoretical but unproven benefit of censorship.

— John Paul Stevens