"Be a mensch," my parents told me. Literally, a mensch is a person. But by implication, a mensch is an upstanding person who takes responsibility for his actions. The people now running America aren't mensches.

Dick Cheney isn't a mensch. There have been many attempts to turn the shooting of Harry Whittington into a political metaphor, but the most characteristic moment was the final act — the Moscow show-trial moment in which the victim of Mr. Cheney's recklessness apologized for getting shot. Remember, Mr. Cheney, more than anyone else, misled us into the Iraq war. Then, when neither links to Al Qaeda nor W.M.D. materialized, he shifted the blame to the very intelligence agencies he bullied into inflating the threat.

Donald Rumsfeld isn't a mensch. Before the Iraq war Mr. Rumsfeld muzzled commanders who warned that we were going in with too few troops, and sidelined State Department experts who warned that we needed a plan for the invasion's aftermath. But when the war went wrong, he began talking about "unknown unknowns" and going to war with "the army you have," ducking responsibility for the failures of leadership that have turned the war into a stunning victory — for Iran.

Michael Chertoff, the secretary of homeland security, isn't a mensch. Remember his excuse for failing to respond to the drowning of New Orleans? "I remember on Tuesday morning," he said on "Meet the Press," "picking up newspapers and I saw headlines, 'New Orleans Dodged the Bullet.' " There were no such headlines, at least in major newspapers, and we now know that he received — and ignored — many warnings about the unfolding disaster.

Michael Leavitt, the secretary of health and human services, isn't a mensch. He insists that the prescription drug plan's catastrophic start doesn't reflect poorly on his department, that "no logical person" would have expected "a transition happening that is so large without some problems." In fact, Medicare's 1966 startup went very smoothly. That didn't happen this time because his department ignored outside experts who warned, months in advance, about exactly the disaster that has taken place.

I could go on. Officials in this administration never take responsibility for their actions. When something goes wrong, it's always someone else's fault.

Was it always like this? I don't want to romanticize our political history, but I don't think so. Think of Dwight Eisenhower, who wrote a letter before D-Day accepting the blame if the landings failed. His modern equivalent would probably insist that the landings were a "catastrophic success," then try to lay the blame for their failure on the editorial page of The New York Times.

Where have all the mensches gone? The character of the administration reflects the character of the man at its head. President Bush is definitely not a mensch; his inability to admit mistakes or take responsibility for failure approaches the pathological. He surrounds himself with subordinates who share his aversion to facing unpleasant realities. And as long as his appointees remain personally loyal, he defends their performance, no matter how incompetent. After all, to do otherwise would be to admit that he made a mistake in choosing them. Last week he declared that Mr. Leavitt is doing, yes, "a heck of a job."

But how did such people attain power in the first place? Maybe it's the result of our infantilized media culture, in which politicians, like celebrities, are judged by the way they look, not the reality of their achievements. Mr. Bush isn't an effective leader, but he plays one on TV, and that's all that matters.

Whatever the reason for the woeful content of our leaders' character, it has horrifying consequences. You can't learn from mistakes if you won't admit making any mistakes, an observation that explains a lot about the policy disasters of recent years — the failed occupation of Iraq, the failed response to Katrina, the failed drug plan.

Above all, the anti-mensches now ruling America are destroying our moral standing. A recent National Journal report finds that we're continuing to hold many prisoners at Guantánamo even though the supposed evidence against them has been discredited. We're even holding at least eight prisoners who are no longer designated enemy combatants. Why? Well, releasing people you've imprisoned by mistake means admitting that you made a mistake. And that's something the people now running America never do.