What are the motives and impulses behind the current wave of online denunciations of incorrect opinion? What is distinctive about the recent rise of mob violence? How does political extremism threaten American principles of government like toleration, free speech, and compromise?  In this Conversation, Christine Rosen, a senior writer at Commentary, shares her perspective on cancel culture and the illiberal turn in American politics. Rosen argues that worthy goals like confronting injustices in American civic life are liable to be hurt rather than helped by extremism and violence. According to Rosen, there is no alternative but to rely on American’s time-tested methods of resolving disputes: the processes of liberal constitutionalism.