EXTRA! Update NEW YORK CITY—If the first casualty of war is the truth, any dispatch from Afghanistan was likely to slay it in its very first word. The dateline says: We are there, we saw it happen. But they weren’t. They didn’t. Poor Geraldo Rivera got slugged for pretending otherwise. A crossover from MSNBC to Fox News in the rating wars, he was on his first combat mission for Rupert Murdoch (Extra!, 1-2/02). He let it be known that he was armed to the teeth, or at least to the ankle holster, raring to track the enemy into his cave. [...]