That the “openness” that liberal society rightly cherishes is not a vacuous openness to all points of view: it is not “value neutral.” It need not, indeed it cannot, say Yes to all comers, to the Islamofascist who after all has his point of view, just as much as the soccer mom, who has hers.

That is the heart of it. The limit case of any liberal society is reached wherever it could vote itself out of the ability to change its mind.