"As Karl Pepper posited:The paradox of tolerance - states that if a society's practice of tolerance is inclusive of the intolerant, intolerance will ultimately dominate, eliminating the tolerant and the practice of tolerance with them. Karl Popper described it as the seemingly self-contradictory idea that, in order to maintain a tolerant society, the society must retain the right to be intolerant of intolerance."

It is a bit like fighting for peace - sometimes it is necessary.