Ronald Reagan’s Benghazi ,” by Jane Mayer. When militants struck American officials in Beirut under Reagan, Congress pointed fingers at the perpetrators, not at political rivals.

Late Saturday night, at the Vanity Fair party celebrating the White House Correspondents’ Association Dinner, Darrell Issa, the Republican congressman from San Diego, California, was chatting amiably with Governor Chris Christie, of New Jersey, leaning in to swap gossip and looking very much at ease in his tuxedo. Issa, who has been the lead inquisitor into what, in shorthand, has come to be known as “Benghazi,” was having a busy weekend. House Speaker John Boehner had just announced a plan for a new special select investigative committee, and, on Friday, Issa had announced that he had issued a subpoena to Secretary of State John Kerry for a new round of hearings devoted to searching, against diminishing odds, for some dirty, dark secret about what really happened in Benghazi.

Ever since militant jihadists killed four Americans, including the U.S. Ambassador, in an attack on a U.S. diplomatic outpost in that remote Libyan town two years ago, House Republicans have kept up a drumbeat of insinuation. They have already devoted thirteen hearings, twenty-five thousand pages of documents, and fifty briefings to the topic, which have turned up nothing unexpected. Kerry’s predecessor, Hillary Clinton, has already accepted responsibility for the tragedy, and the State Department has issued a critical independent report on diplomatic security, resulting in the dismissal of four employees. If the hearings accomplish nothing else, it seems that they promise to keep the subject on life support at least through the midterm congressional elections, and possibly on through any potential Hillary Clinton Presidential campaign. The word “impeachment” has even been trotted out by Obama opponents in connection with this non-scandal.

Watching Issa silhouetted against the Belle Époque windows of the Italian Ambassador’s residence, which were wide open to a garden bathed in colored spotlights, I found myself thinking about another tragedy, thirty years ago, that played out very differently.

Around dawn on October 23, 1983, I was in Beirut, Lebanon, when a suicide bomber drove a truck laden with the equivalent of twenty-one thousand pounds of TNT into the heart of a U.S. Marine compound, killing two hundred and forty-one servicemen. The U.S. military command, which regarded the Marines’ presence as a non-combative, “peace-keeping mission,” had left a vehicle gate wide open, and ordered the sentries to keep their weapons unloaded. The only real resistance the suicide bomber had encountered was a scrim of concertina wire. When I arrived on the scene a short while later to report on it for the Wall Street Journal, the Marine barracks were flattened. From beneath the dusty, smoking slabs of collapsed concrete, piteous American voices could be heard, begging for help. Thirteen more American servicemen later died from injuries, making it the single deadliest attack on American Marines since the Battle of Iwo Jima.

Six months earlier, militants had bombed the U.S. embassy in Beirut, too, killing sixty-three more people, including seventeen Americans. Among the dead were seven C.I.A. officers, including the agency’s top analyst in the Middle East, an immensely valuable intelligence asset, and the Beirut station chief.

There were more than enough opportunities to lay blame for the horrific losses at high U.S. officials’ feet. But unlike today’s Congress, congressmen did not talk of impeaching Ronald Reagan, who was then President, nor were any subpoenas sent to cabinet members. This was true even though then, as now, the opposition party controlled the majority in the House. Tip O’Neill, the Democratic Speaker of the House, was no pushover. He, like today’s opposition leaders in the House, demanded an investigation—but a real one, and only one. Instead of playing it for political points, a House committee undertook a serious investigation into what went wrong at the barracks in Beirut. Two months later, it issued a report finding “very serious errors in judgment” by officers on the ground, as well as responsibility up through the military chain of command, and called for better security measures against terrorism in U.S. government installations throughout the world.

In other words, Congress actually undertook a useful investigation and made helpful recommendations. The report’s findings, by the way, were bipartisan. (The Pentagon, too, launched an investigation, issuing a report that was widely accepted by both parties.)

In March of 1984, three months after Congress issued its report, militants struck American officials in Beirut again, this time kidnapping the C.I.A.’s station chief, Bill Buckley. Buckley was tortured and, eventually, murdered. Reagan, who was tormented by a tape of Buckley being tortured, blamed himself. Congress held no public hearings, and pointed fingers at the perpetrators, not at political rivals.

If you compare the costs of the Reagan Administration’s serial security lapses in Beirut to the costs of Benghazi, it’s clear what has really deteriorated in the intervening three decades. It’s not the security of American government personnel working abroad. It’s the behavior of American congressmen at home.

The story in Beirut wasn’t over. In September of 1984, for the third time in eighteen months, jihadists bombed a U.S. government outpost in Beirut yet again. President Reagan acknowledged that the new security precautions that had been advocated by Congress hadn’t yet been implemented at the U.S. embassy annex that had been hit. The problem, the President admitted, was that the repairs hadn’t quite been completed on time. As he put it, “Anyone who’s ever had their kitchen done over knows that it never gets done as soon as you wish it would.” Imagine how Congressman Issa and Fox News would react to a similar explanation from President Obama today.

Photograph by Reza/Webistan/Corbis.