Pakistan is not a completely gelled country like the US or the Western European countries, with a strong central government that can unequivocally speak for the nation. There is a lot going on, in different directions within it (The ISI, various armed forces factions, tribal regions, the Westernized upper portion of the urban population, Communists, to name but a few), regardless of whatever nominal position the national government may take on an issue. If it were not for the external threat of India, it would probably break up into smaller entities much like Yugoslavia did in the 90s, probably with at least as much bloodshed in the process. A shattered Pakistan would probably be much more of a problem for us than a schizoid and unrelieable, but nominally intact, country.