If Keynes was Luther, Friedman was Ignatius of Loyola, founder of the Jesuits. And like the Jesuits, Friedman’s followers have acted as a sort of disciplined army of the faithful, spearheading a broad, but incomplete, rollback of Keynesian heresy. By the century’s end, classical economics had regained much though by no means all of its former dominion, and Friedman deserves much of the credit.

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Nonetheless, William Barr — again, the nation’s chief law enforcement officer, responsible for defending the Constitution — is sounding remarkably like America’s most unhinged religious zealots, the kind of people who insist that we keep experiencing mass murder because schools teach the theory of evolution. Guns don’t kill people — Darwin kills people!

You can’t explain the votes of places like Clay County as a response to disagreements about trade policy. The only way to make sense of what happened is to see the vote as an expression of, well, identity politics — some combination of white resentment at what voters see as favoritism toward nonwhites (even though it isn’t) and anger on the part of the less educated at liberal elites whom they imagine look down on them.

Nobody can credibly promise to bring the old jobs back; what you can promise — and Mrs. Clinton did — are things like guaranteed health care and higher minimum wages. But working-class whites overwhelmingly voted for politicians who promise to destroy those gains.

The Sanders campaign has brought out a lot of idealism and energy that the progressive movement needs. It has also, however, brought out a streak of petulant self-righteousness among some supporters. Has it brought out that streak in the candidate, too?

Holding people accountable for their past is O.K., but imposing a standard of purity, in which any compromise or misstep makes you the moral equivalent of the bad guys, isn’t. Abraham Lincoln didn’t meet that standard; neither did F.D.R. Nor, for that matter, has Bernie Sanders (think guns).