The second failure was a failure of recognition and self-critique, in which the right’s best minds deceived themselves about (or made excuses for) the toxic tendencies of populism, which were manifest in various hysterias long before Sean Hannity swooned for Donald Trump. What the intellectuals did not see clearly enough was that Fox News and talk radio and the internet had made right-wing populism more powerful, relative to conservatism’s small elite, than it had been during the Nixon or Reagan eras, without necessarily making it more serious or sober than its Bircher-era antecedents.

Some conservatives told themselves that Fox and Drudge and Breitbart were just the evolving right-of-center alternative to the liberal mainstream media, when in reality they were more fact-averse and irresponsible. Others (myself included) told ourselves that this irresponsibility could be mitigated by effective statesmanship, when in reality political conservatism’s leaders — including high-minded figures like Paul Ryan — turned out to have no strategy save self-preservation.

Both of these errors were linked to the most important failure of the right’s intellectuals: The failure to translate the power accrued through their alliance with populists into a revolution within the managerial class — one that would have ultimately made conservatism less dependent on the vagaries and venom of populism, made the right-leaning intelligentsia less of a wobbly peak and more of a sturdy spire.

Partial revolutions there were. Free-market ideas were absorbed into the managerial consensus after the stagflation of the 1970s. The fall of Communism lent a retrospective luster to Reaganism within the foreign policy establishment. There was even a period in the 1990s — and again, briefly, after Sept. 11 — when a soft sort of social conservatism seemed to be making headway among Atlantic-reading, center-left mandarins.

But the same Bush-era failures that alienated right-wing populists from their own intelligentsia also discredited conservative ideas within the broader elite. And then the progress of sexual individualism and the energy of a renascent left has pulled that elite further left across the last eight years.

So it is that today, three generations after Buckley and Burnham, the academy and the mass media are arguably more hostile to conservative ideas than ever, and the courts and the bureaucracy are trending in a similar direction.