From the article:
The ruling class's component groups jointly dismiss America's traditional liberties because they aim to replace them with their own primacy. Having seized the power to redefine liberty, our rulers tighten their definitions around their opponents' necks like nooses. Since their desire for primacy has no limit, they can't stop tightening. The norms that they demand that we honor help sustain each constituency by letting its members feel good about themselves while looking down on others. Their "dignitary interests" (to use Justice Kennedy's term for who must be honored vs. those who must submit to being vilified) simply trump those of others. This is why the ruling class demonizes any questioning of its demands' substance by imposing modern equivalents of the slave-era "gag rule." They wage identity politics as war.
This is a bit long but really good stuff. Codevilla nails it. Notice, he does not talk about Left and Right, or Democrat and Republican. He talks about the "ruling class".