Anybody visiting the Middle East in the last decade has had the experience: meeting the hoarse and aggressive person who first denies that Osama Bin Laden was responsible for the destruction of the World Trade Center and then proceeds to describe the attack as a justified vengeance for decades of American imperialism. This cognitive dissonance—to give it a polite designation—does not always take that precise form. Sometimes the same person who hails the bravery of al-Qaida’s martyrs also believes that the Jews planned the “operation.” As far as I know, only leading British “Truther” David Shayler, a former intelligence agent who also announced his own divinity, has denied that the events of Sept. 11, 2001, took place at all. (It was apparently by means of a hologram that the widespread delusion was created on television.) In his recent article for Guernica magazine, however, professor Noam Chomsky decides to leave that central question open. We have no more reason to credit Osama Bin Laden’s claim of responsibility, he states, than we would have to believe Chomsky’s own claim to have won the Boston Marathon.

I can’t immediately decide whether or not this is an improvement on what Chomsky wrote at the time. Ten years ago, apparently sharing the consensus that 9/11 was indeed the work of al-Qaida, he wrote that it was no worse an atrocity than President Clinton’s earlier use of cruise missiles against Sudan in retaliation for the bomb attacks on the centers of Nairobi and Dar es Salaam. (I haven’t been back to check on whether he conceded that those embassy bombings were also al-Qaida’s work to begin with.) He is still arguing loudly for moral equivalence, maintaining that the Abbottabad, Pakistan, strike would justify a contingency whereby “Iraqi commandos landed at George W. Bush’s compound, assassinated him, and dumped his body in the Atlantic.” (Indeed, equivalence might be a weak word here, since he maintains that, “uncontroversially, [Bush’s] crimes vastly exceed bin Laden’s.”) So the main new element is the one of intriguing mystery. The Twin Towers came down, but it’s still anyone’s guess who did it. Since “April 2002, [when] the head of the FBI, Robert Mueller, informed the press that after the most intensive investigation in history, the FBI could say no more than that it ‘believed’ that the plot was hatched in Afghanistan,” no evidence has been adduced. “Nothing serious,” as Chomsky puts it, “has been provided since.”

Chomsky still enjoys some reputation both as a scholar and a public intellectual. And in the face of bombardments of official propaganda, he prides himself in a signature phrase on his stern insistence on “turning to the facts.” So is one to assume that he has pored through the completed findings of the 9/11 Commission? Viewed any of the videos in which the 9/11 hijackers are seen in the company of Bin Laden and Ayman al-Zawahiri? Read the transcripts of the trial of Zacarias Moussaoui, the so-called “20th hijacker“? Followed the journalistic investigations of Lawrence Wright, Peter Bergen, or John Burns, to name only some of the more salient? Acquainted himself with the proceedings of associated and ancillary investigations into the bombing of the USS Cole or indeed the first attempt to bring down the Twin Towers in the 1990s?

With the paranoid anti-war “left,” you never quite know where the emphasis is going to fall next. At the Telluride Film Festival in 2002, I found myself debating Michael Moore, who, a whole year after the attacks, maintained that Bin Laden was “innocent until proved guilty” (and hadn’t been proven guilty). Except that he had, at least according to Moore one day after the attacks, when he wrote that: “WE created the monster known as Osama bin Laden! Where did he go to terrorist school? At the CIA!” So, innocent unless tainted by association with Langley, Va., which did seem to have some heartland flying schools under surveillance before 2001 but which seemed sluggish on the uptake regarding them. For quite some time, in fact, the whole anti-Bush “narrative” involved something rather like collusion with the evil Bin Laden crime family, possibly based on mutual interests in the oil industry. So guilty was Bin Laden, in fact, that he was allowed to prepare for a new Pearl Harbor on American soil by a spineless Republican administration that had ignored daily briefings on the mounting threat. Gore Vidal was able to utter many croaking and suggestive lines to this effect, hinting at a high-level betrayal of the republic.

And then came those who, impatient with mere innuendo, directly accused the administration of rocketing its own Pentagon and bringing about a “controlled demolition” of the World Trade Center. This grand scenario seemed to have a few loose planes left over, since the ones that hit the towers were only a grace note to the more ruthless pre-existing sabotage and the ones in Virginia and Pennsylvania, complete with passengers and crews and hijackers, somehow just went missing.

It’s no criticism of Chomsky to say that his analysis is inconsistent with that of other individuals and factions who essentially think that 9/11 was a hoax. However, it is remarkable that he should write as if the mass of evidence against Bin Laden has never been presented or could not have been brought before a court. This form of 9/11 denial doesn’t trouble to conceal an unstated but self-evident premise, which is that the United States richly deserved the assault on its citizens and its civil society. After all, as Chomsky phrases it so tellingly, our habit of “naming our murder weapons after victims of our crimes: Apache, Tomahawk … [is] as if the Luftwaffe were to call its fighter planes ‘Jew’ and ‘Gypsy.’ ” Perhaps this is not so true in the case of Tomahawk, which actually is the name of a weapon, but the point is at least as good as any other he makes.

In short, we do not know who organized the attacks of Sept. 11, 2001, or any other related assaults, though it would be a credulous fool who swallowed the (unsupported) word of Osama Bin Laden that his group was the one responsible. An attempt to kidnap or murder an ex-president of the United States (and presumably, by extension, the sitting one) would be as legally justified as the hit on Abbottabad. And America is an incarnation of the Third Reich that doesn’t even conceal its genocidal methods and aspirations. This is the sum total of what has been learned, by the guru of the left, in the last decade.