Learned from Kira

Simple math.

Intolerance(-) of intolerance(-) is(=) tolerance(+).

Tolerance(+) of intolerance(-) is(=) intolerance(-).

Tolerance(+) of tolerance(+) is(=) tolerance(+).

- I love this community so much.
- That time Spock heard about Daft Punk.
Also called The Paradox of Tolerance, as explained by Karl Popper (one of my favorite philosophers).
Although, as you showed, there are several ways to illustrate that it's not really a paradox. My favorite is to consider that tolerance is a social contract entered into by every participant; those who are intolerant are breaching that contact and are therefore not protected by it.
- The “tolerance paradox” is a handy tool with which to justify violence by those on both sides. If I’m just fighting intolerance, then my actions are justified. It’s a common rally cry used by authoritarians to stamp out diversity and democracy. To really hammer the point home, the Nazis were the first to employ it. By blaming their issues on the “intolerance” of foreign states, they justified a global war. It is obviously the inspiration for Popper’s 1945 work, The Open Society and Its Enemies. Russia is currently using this fallacy to justify the war in Ukraine, claiming that the West is “intolerant” of Russia, and they need to defend themselves against this intolerance.
  Here is a full quote from Popper on the subject if anyone is interested.
  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.
  Popper’s argument is laid bare here. Tolerate up to the point of violence. That is, if one physically attacks us, we no longer have the burden of tolerance. Popper is commonly misquoted and intentionally misused to justify violence against disagreement, and that is clearly not his argument.

The whole “tolerance paradox” can be solved by a very simple fact: Those that seek to break the social contract we all live under do not get afforded the benefits of said social contract.

By the very nature of trying to break/corrupt it you have nullified it for yourself. And until you are willing to abide by it again, you face the same punishment as those that break any of our laws. Your rights restricted, confinement, financial penalties, etc.

That is Popper's own proposed solution for that paradox: Tolerance is not to be extended to the intolerant.
He suggests trying to work within the bounds of the contract first (talking, reasoning, voting etc.), but if that fails or is impossible endorses the censorship and suppression (violent, if necessary) of the intolerant. Try the high road, but be willing to acknowledge when that road is a dead end and ready to correct course in time.
- That take seems too measured for some people, sadly. But it is the right way.