This is sort of restating Karl Poppers "Pardox of Intolerance". As Popper points out, If you do tolerate intolerance, you end up awash in intolerance.
https://en.m.wikipedia.org/wiki/Paradox_of_tolerance
The paradox of tolerance is a philosophical concept suggesting that if a society extends tolerance to those who are intolerant, it risks enabling the eventual dominance of intolerance; thereby undermining the very principle of tolerance. This paradox was articulated by philosopher Karl Popper in The Open Society and Its Enemies (1945)