They have earned the right not to be listened to
Fallows nails it.
Am I sounding a little testy here? You bet. We all make mistakes. But we are talking about people in public life—writers, politicians, academics—who got the biggest strategic call in many decades completely wrong. Wrong as a matter of analysis, wrong as a matter of planning, wrong as a matter of execution, wrong in conceiving American interests in the broadest sense. None of these people did that intentionally, and many of them have honestly reflected and learned. But we now live with (and many, many people have died because of) the consequences of their gross misjudgments a dozen years ago. In the circumstances, they might have the decency to shut the hell up on this particular topic for a while. They helped create the disaster Iraqis and others are now dealing with. They have earned the right not to be listened to.