“Tolerance is not only a key feature of liberalism, but—familiarly—its paradox too. Liberalism’s tolerance leaves the democracy of ideas to decide which among opposing viewpoints will prevail. The risk is the death of liberty itself, because those who live by hard and uncompromising views in political, moral and religious respects always, if given half a chance, silence liberals because liberalism, by its nature, threatens the hegemony they seek to impose.”