Paradox of Tolerance
en.wikipedia.org
en.wikipedia.org
For instance, suppose we define "tolerance" for a viewpoint as "not killing people for uttering words expressing that viewpoint" (a relatively weak example of free expression and tolerance for free expression, but necessary for broader concepts of free expression and tolerating expression). If a society is tolerant of intolerance (i.e. does not kill people for expressing the viewpoint that killing people for expressing a viewpoint is okay), then eventually the people with the viewpoint that killing people for expressing a viewpoint is okay will dominate. That is not a logically sound conclusion/paradox at all.
About the only definition of "tolerance" that results in the paradox is: "will follow any command by others" or similar, but that is a fundamentally absurd position that amounts to equating tolerance with literal willing slavery. It is hard to find any reasonable, clear definition of tolerance, whatever you may choose for what you think that word means, that results in a paradox. The paradox of tolerance is just a word game where the other kid says "infinity + 1" to trump you.
When one party breaks the contract, the other party is no longer under any obligation to abide by it either.