Many of Mr. Trump’s supporters, who get their news from Breitbart and Alex Jones, from conservative talk radio and Fox News, want a revolution, not accommodation. I’m acquainted with some of these individuals and I hear from them all the time. Their rage at the establishment is off the charts. They want to burn the village down. Until now all the energy has been with them, and it is laughable to think that passing tax cuts will satiate them.

That’s why, for many of the lifelong Republican conservatives who never boarded the Trump train, it is particularly disappointing that the Republican leaders we know who have deep disagreements with Mr. Trump and Mr. Bannon are for the most part unwilling to make the counter-case in a forceful and comprehensive fashion. Nor are his private critics rushing to go public with their often mordant analyses of Mr. Trump’s movement.

They each have their reasons, and some are more understandable than others. Still, I can’t help but feel that they are badly underestimating the gravity of the moment. They are willfully ignoring the danger Trumpism and Bannonism pose to many of the principles they claim to hold dear, and they are deluding themselves into believing that a rapprochement is possible with those who are determined to destroy them.