I don't think anyone is concerned that they nation of pakistan will attack the U.S. with nuclear weapons.  The issue is that if Pakistan were to go into a state of chaos it is possible that a nuclear weapons or components would be transfered to stateless terrorist organizations who then might smuggle a bomb into the U.S. 

I will agree that the policy of trying to put Bhutto in power that the state department was working on is stupid from the outset.  Did they think that it would have any other outcome?  Our stupid meddling has only increased the chance of the anarchy the state department types feared.  The problem with Bush is that he is an idealist rather than a pragmatist.  Consider his insistance that the Palestinian Authority hold election only to get the radical Hamas elected.  Or the stupid Bremmer policies in Iraq that basically caused the insurgency. 

I think that Musharif has things under control in Pakistan than Paul thinks.  He is hardly a puppet of the U.S. either.  He has tilted toward our policy when we were presenting a strong front but now that we are divided again his is being more responsive to certain internal forces.  I really doubt there will really be a civil war. One could have made the same comment about our situation in the late 1960s but it didn't happen but there were lots of riots.