Pakistani rulers play on different tables, not unlike the Saudis (and the US). They used Islamic extremists in Kashmir and in Afghanistan to pursue their own goals, so they wouldn't just drop them like a hat the day the US came knocking. There is ample literature on the mutual distrust between US and Pakistani security services during the "war on terror".
In many ways, Pakistan is like Saudi Arabia or Turkey: countries the US cannot afford not to be allies, but with very different strategic interests, often conflicting with US ones. I don't find at all strange that they might have harbored Osama all along, just as another bit of leverage in the eternal game of foreign policy.
In many ways, Pakistan is like Saudi Arabia or Turkey: countries the US cannot afford not to be allies, but with very different strategic interests, often conflicting with US ones. I don't find at all strange that they might have harbored Osama all along, just as another bit of leverage in the eternal game of foreign policy.