And at this point we have plenty of evidence to confirm everything the war’s opponents were saying. We now know, for example, that on 9/11 itself — literally before the dust had settled — Donald Rumsfeld, the secretary of defense, was already plotting war against a regime that had nothing to do with the terrorist attack. “Judge whether good enough [to] hit S.H. [Saddam Hussein] ...sweep it all up things related and not”; so read notes taken by Mr. Rumsfeld’s aide.

This was, in short, a war the White House wanted, and all of the supposed mistakes that, as Jeb puts it, “were made” by someone unnamed actually flowed from this underlying desire. Did the intelligence agencies wrongly conclude that Iraq had chemical weapons and a nuclear program? That’s because they were under intense pressure to justify the war. Did prewar assessments vastly understate the difficulty and cost of occupation? That’s because the war party didn’t want to hear anything that might raise doubts about the rush to invade. Indeed, the Army’s chief of staff was effectively fired for questioning claims that the occupation phase would be cheap and easy.

Why did they want a war? That’s a harder question to answer. Some of the warmongers believed that deploying shock and awe in Iraq would enhance American power and influence around the world. Some saw Iraq as a sort of pilot project, preparation for a series of regime changes. And it’s hard to avoid the suspicion that there was a strong element of wagging the dog, of using military triumph to strengthen the Republican brand at home.

Whatever the precise motives, the result was a very dark chapter in American history. Once again: We were lied into war.

Now, you can understand why many political and media figures would prefer not to talk about any of this. Some of them, I suppose, may have been duped: may have fallen for the obvious lies, which doesn’t say much about their judgment. More, I suspect, were complicit: they realized that the official case for war was a pretext, but had their own reasons for wanting a war, or, alternatively, allowed themselves to be intimidated into going along. For there was a definite climate of fear among politicians and pundits in 2002 and 2003, one in which criticizing the push for war looked very much like a career killer.