...Let's say that the item that Newsweek magazine disavowed on Sunday and retracted yesterday — the item by Michael Isikoff and John Barry.... was actually true. It wasn't. But let's say it was. Would factual accuracy have justified publishing the item in Newsweek or anywhere else?... There's no question that, for journalists in trouble, truth is always the best defense in a courtroom. But the world is not a courtroom.... And so what if the item had been true? Journalists routinely withhold the truth from their readers for all sorts of reasons. They don't reveal the names of "good and...