Gore Vidal wrote in 2002 that “Media was assigned its familiar task of inciting public opinion against Osama bin Laden, still not the proven mastermind.”

More than a decade ago, I sat on a panel in New York to review the life and work of Oscar Wilde. My fellow panelist was that heroic old queen Quentin Crisp, perhaps the only man ever to have made a success of the part of Lady Bracknell in The Importance of Being Earnest. Inevitably there arose the question: Is there an Oscar Wilde for our own day? The moderator proposed Gore Vidal, and, really, once that name had been mentioned, there didn’t seem to be any obvious rival.

Like Wilde, Gore Vidal combined tough-mindedness with subversive wit (The Importance of Being Earnest is actually a very mordant satire on Victorian England) and had the rare gift of being amusing about serious things as well as serious about amusing ones. Like Wilde, he was able to combine radical political opinions with a lifestyle that was anything but solemn. And also like Wilde, he was almost never “off”: his private talk was as entertaining and shocking as his more prepared public appearances. Admirers of both men, and of their polymorphous perversity, could happily debate whether either of them was better at fiction or in the essay form.

I was fortunate enough to know Gore a bit in those days. The price of knowing him was exposure to some of his less adorable traits, which included his pachydermatous memory for the least slight or grudge and a very, very minor tendency to bring up the Jewish question in contexts where it didn’t quite belong. One was made aware, too, that he suspected Franklin Roosevelt of playing a dark hand in bringing on Pearl Harbor and still nurtured an admiration in his breast for the dashing Charles Lindbergh, leader of the American isolationist right in the 1930s. But these tics and eccentricities, which I did criticize in print, seemed more or less under control, and meanwhile he kept on saying things one wished one had said oneself. Of a certain mushy spiritual writer named Idries Shah: “These books are a great deal harder to read than they were to write.” Of a paragraph by Herman Wouk: “This is not at all bad, except as prose.” He once said to me of the late Teddy Kennedy, who was then in his low period of red-faced, engorged, and abandoned boyo-hood, that he exhibited “all the charm of three hundred pounds of condemned veal.” Who but Gore could begin a discussion by saying that the three most dispiriting words in the English language were “Joyce Carol Oates”? In an interview, he told me that his life’s work was “making sentences.” It would have been more acute to say that he made a career out of pronouncing them.

However, if it’s true even to any degree that we were all changed by September 11, 2001, it’s probably truer of Vidal that it made him more the way he already was, and accentuated a crackpot strain that gradually asserted itself as dominant. If you look at his writings from that time, thrown together in a couple of cheap paperbacks entitled Dreaming War and Perpetual War for Perpetual Peace, you will find the more crass notions of Michael Moore or Oliver Stone being expressed in language that falls some distance short of the Wildean ideal. “Meanwhile, Media was assigned its familiar task of inciting public opinion against Osama bin Laden, still not the proven mastermind.” To that “sentence,” abysmal as it is in so many ways, Vidal put his name in November 2002. A small anthology of half-argued and half-written shock pieces either insinuated or asserted that the administration had known in advance of the attacks on New York and Washington and was seeking a pretext to build a long-desired pipeline across Afghanistan. (Not much sign of that, incidentally, not that the luckless Afghans mightn’t welcome it.) For academic authority in this Grassy Knoll enterprise, Vidal relied heavily on the man he thought had produced “the best, most balanced report” on 9/11, a certain Nafeez Mosaddeq Ahmed, of the Institute for Policy Research & Development, whose book The War on Freedom had been brought to us by what Vidal called “a small but reputable homeland publisher.” Mr. Ahmed on inspection proved to be a risible individual wedded to half-baked conspiracy-mongering, his “Institute” a one-room sideshow in the English seaside town of Brighton, and his publisher an outfit called “Media Monitors Network” in association with “Tree of Life,” whose now-deceased Web site used to offer advice on the ever awkward question of self-publishing. And to think that there was once a time when Gore Vidal could summon Lincoln to the pages of a novel or dispute points of strategy with Henry Cabot Lodge …