By Paul Krugman. New York Times.

So Representative Kevin McCarthy, who was supposed to succeed John Boehner as speaker of the House, won’t be pursuing the job after all. He would have faced a rough ride both winning the post and handling it under the best of circumstances, thanks to the doomsday caucus — the fairly large bloc of Republicans demanding that the party cut off funds to Planned Parenthood, or kill Obamacare, or anyway damage something liberals like, by shutting down the government and forcing it into default.

Still, he finished off his chances by admitting — boasting, actually — that the endless House hearings on Benghazi had nothing to do with national security, that they were all about inflicting political damage on Hillary Clinton.

But we all knew that, didn’t we?

I often wonder about commentators who write about things like those hearings as if there were some real issue involved, who keep going on about the Clinton email controversy as if all these months of scrutiny had produced any evidence of wrongdoing, as opposed to sloppiness.

Surely they have to know better, whether they admit it to themselves or not. And surely the long history of Clinton nonscandals and retracted allegations — remember, there never was anything to the Whitewater accusations — should serve as a cautionary tale.

Somehow, though, politicians who pretend to be concerned about issues, but are obviously just milking those issues for political gain, keep getting a free pass. And it’s not just a Clinton story.

Consider the example of an issue that might seem completely different, one that dominated much of our political discourse just a few years ago: federal debt.

Many prominent politicians made warnings about the dangers posed by U.S. debt, especially debt owned by China, a central part of their political image. Paul Ryan, when he was chairman of the House Budget Committee, portrayed himself as a heroic crusader against deficits. Mitt Romney made denunciations of borrowing from China a centerpiece of his campaign for president. And by and large, commentators treated this posturing as if it were serious. But it wasn’t.

I don’t mean that it was bad economics, although it was. Remember all the dire warnings about what would happen if China stopped buying our debt, or worse yet, started selling it? Remember how interest rates would soar and America would find itself in crisis?

Well, don’t tell anyone, but the much feared event has happened: China is no longer buying our debt, and is in fact selling tens of billions of dollars in U.S. debt every month as it tries to support its troubled currency. And what has happened is what serious economic analysis always told us would happen: nothing. It was always a false alarm.

Beyond that, however, it was a fake alarm.

If you looked at all closely at the plans and proposals released by politicians who claimed to be deeply worried about deficits, it soon became obvious that they were just pretending to care about fiscal responsibility. People who really worry about government debt don’t propose huge tax cuts for the rich, only partly offset by savage cuts in aid to the poor and middle class, and base all claims of debt reduction on unspecified savings to be announced on some future occasion.

And once fiscal scare tactics started to lose political traction, even the pretense went away. Just look at the people seeking the Republican presidential nomination. One after another, they have been proposing giant tax cuts that would add trillions to the deficit.

Debt, it seems, only matters when there’s a Democrat in the White House. Or more accurately, all the talk about debt wasn’t about fiscal prudence; it was about trying to inflict political damage on President Obama, and it stopped when the tactic lost effectiveness.

Again, none of this should come as news to anyone who follows politics and policy even moderately closely. But I’m not sure that normal people, who have jobs to do and families to raise, are getting the message. After all, who will tell them?

Sometimes I have the impression that many people in the media consider it uncouth to acknowledge, even to themselves, the fraudulence of much political posturing. The done thing, it seems, is to pretend that we’re having real debates about national security or economics even when it’s both obvious and easy to show that nothing of the kind is actually taking place.

But turning our eyes away from political fakery, pretending that we’re having a serious discussion when we aren’t, is itself a kind of fraudulence. Mr. McCarthy inadvertently did the nation a big favor with his ill-advised honesty, but telling the public what’s really going on shouldn’t depend on politicians with loose lips.

Sometimes — all too often — there’s no substance under the shouting. And then we need to tell the truth, and say that it’s all Benghazi.