Two things have fundamentally changed the landscape. First, over the past two years conservatives have self-marginalized. In supporting Donald Trump they have tied themselves to a man whose racial prejudices, sexual behavior and personal morality put him beyond the pale of decent society.

While becoming the movement of Dinesh D’Souza, Sean Hannity and Franklin Graham, they have essentially expelled the leaders and thinkers who have purchase in mainstream culture. Conservatism is now less a political or philosophic movement and more a separatist subculture that participates in its own ostracism.

Second, progressives are getting better and more aggressive at silencing dissenting behavior. All sorts of formerly legitimate opinions have now been deemed beyond the pale on elite campuses. Speakers have been disinvited and careers destroyed. The boundaries are being redrawn across society.