Paradox of Tolerance:

 

 

In 1945, the Austrian philosopher Karl Popper identified what he terms 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."