The purpose of "free speech" is to protect the minority...

http://judiciallearningcenter.org/your-1st-amendment-rights/

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Freedom of speech is the foundation on which all other 1st Amendment freedoms are based; without it the other freedoms could not exist. The purpose of free speech is to protect the minority, often unpopular, viewpoint from being overpowered by the majority, or by the government. The minority viewpoint needs to be heard because, in the long term, it may shape public opinion.