Soon after the Navy SEAL raid on Bin Laden’s house, a Pakistani official told me that the United States had direct evidence that the ISI chief, Lt. Gen. Ahmed Shuja Pasha, knew of Bin Laden’s presence in Abbottabad. Colleagues at The Times began questioning officials in Washington about which high-ranking officials in Pakistan might also have been aware of Bin Laden’s whereabouts, but everyone suddenly clammed up. It was as if a decision had been made to contain the damage to the relationship between the two governments. “There’s no smoking gun,” officials in the Obama administration began to say. America’s...