It is reasonably widely accepted that Osama bin Laden was able to stay in the Pakistan town of Abbottabad because he had the protection of Pakistan’s military, in particular its powerful Inter Services Intelligence organisation. It would have been all but impossible for bin Laden to have stayed in one place in Pakistan without the ISI knowing, implying it at least tolerated his presence. More likely, the ISI’s involvement was more active than mere tolerance.
The question is, then, no longer whether bin Laden had the active support of the ISI but why Pakistan’s premier intelligence organisation – from a country which is long-time ally of the United States – would host the US’s number one enemy on its soil. At risk is not just the defence relationship with the US but, more importantly, the major strategic deterrent to Pakistan’s principle enemy, India. It also risks the important, $7.5 billion, US aid budget to Pakistan.