Reply #21: Who says there is one? That still does not make invasion viable or a good idea.

[BadgerLaw2010]

The real world does not necessarily present solutions to a given problem.

Here, you would have to invade a very heavily armed country with many times the population of Iraq that is armed with a lot of deliverable nuclear weapons, with no logistics base to do so because of where Pakistan happens to be located.

The US doesn't have the capability to "invade" Pakistan. The only nation that does is India, and that would mean India would have to endure a nuclear war that would probably kill over 50 million. India does not much care for having Pakistani missiles with nuclear warheads lobbed into its cities, or the fallout from India nuking Pakistan drifting back over India.

Nuclear weapons are great aggression deterrants.