Increasingly difficult to explain how Pakistan didn't know where bin Laden was

From the Economist:

Nobody reports seeing other visitors, official-looking or otherwise, coming to number 25. A nearby hospital could perhaps have been useful for a man, such as Mr bin Laden, who suffered from kidney disease. Pakistan's main military academy—the country’s Sandhurst or West Point—is only short distance away on foot. Local residents say that police regularly swept the area, roughly once a week, checking residents' IDs and sometimes looking inside homes. It is hard to believe that this house could have escaped scrutiny for long. Most embarrassing for Pakistan's most powerful man, General Ashfaq Kayani, the chief of staff, is that he was just across the field from number 25 just last week, boasting at the military academy that Pakistan had broken the back of terrorism. At the time Mr bin Laden was within shouting distance of the general. That looks increasingly difficult to explain.