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This is known as the paradox of tolerance and was figured out right after WW2 by Karl Popper, an Austrian philosopher who witnessed the rise of the Nazis. Authoritarians use the framework of a free society to rise to power until they are strong enough to topple it. A free society must be able to defend itself against that approach, even if it might seem contrary to its own values. Here's the way he formulated it: > 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 most 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. We should claim that any movement preaching intolerance places itself outside the law and we should consider incitement to intolerance and persecution as criminal, in the same way as we should consider incitement to murder, or to kidnapping, or to the revival of the slave trade, as criminal. See also: https://en.wikipedia.org/wiki/Paradox_of_tolerance |
Second, as a practical matter, it’s not at all clear what constitutes intolerance. If you think the state has standing to adjudicate intolerance, then I can’t imagine you’ve been paying attention to the kind of routine social errors that are labeled intolerance on social media. The notion that it’s a legitimate function of the state to weigh in on these banal disagreements is risible.