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[Labster]

In order to maintain a tolerant society, the society must be intolerant of intolerance.

or in more detail...

Less well known is the paradox of tolerance: Unlimited tolerance must lead to the disappearance of tolerance. If we extend unlimited tolerance even to those who are intolerant, if we are not prepared to defend a tolerant society against the onslaught of the intolerant, then the tolerant will be destroyed, and tolerance with them. — In this formulation, I do not imply, for instance, that we should always suppress the utterance of intolerant philosophies; as long as we can counter them by rational argument and keep them in check by public opinion, suppression would certainly be unwise. But we should claim the right to suppress them if necessary even by force; for it may easily turn out that they are not prepared to meet us on the level of rational argument, but begin by denouncing all argument; they may forbid their followers to listen to rational argument, because it is deceptive, and teach them to answer arguments by the use of their fists or pistols. We should therefore claim, in the name of tolerance, the right not to tolerate the intolerant.

In the United States, we have this society where "free speech" must be protected always always always, except if that speech is perjury, fraud, false advertising, conspiracy to commit a crime, tax evasion, reckless endangerment, falsification of records, obstruction of justice, underage sexting, espionage, stalking, incitement to violence, copyright infringement, trademark infringement, obscenity, insider trading, or potentially anything said by a minor in a public school classroom.