Karl Popper in 1992. Acclaimed philosopher Karl Popper considered how we should tolerate the intolerant while an academic in Christchurch during World War II. In July 1927, Karl Popper witnessed a massacre in his hometown of Vienna, Austria. "Unlimited tolerance must lead to the disappearance of tolerance," Popper wrote. Popper wrote that Open Society was "my war effort".

Source: Stuff March 22, 2019 15:56 UTC