The paradox of tolerance was described by Karl Popper in 1945. The paradox states that if a society is tolerant without limit, their ability to be tolerant will eventually be seized or destroyed by the intolerant. Popper came to the seemingly paradoxical conclusion that in order to maintain a tolerant society, the society must be intolerant of intolerance.
I learned this one as part of a post about Alex Jones on Daring Fireball. It’s never been more relevant in my lifetime than now. With the cheeto-coloured American president and his ever-more-brave band of harpies causing just … tragedy across the globe.