In 1945 Karl Popper addressed the paradox of tolerance in his book, The Open Society and Its Enemies. Popper wrote “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.” He also argued that in exercising the right of self-preservation a tolerant society should be intolerant of intolerance, not by suppression but through the countering of irrational intolerance with rational argument. What really causes intolerance in modern days ?