NATO supplies must be blocked, no doubt, but also look at this angle ! The supplies are also the source of weapons for Afghan Mujahideen ! There are nearly quarter of a million weapons stolen from NATO forces and containers which pass through Pakistan and those weapons have destroyed the US, as no countyr was allowed to give weapons to Afghan Taliban !! Now got it ??
If Pakistan was supporting US, we would have destroyed Afghan Taliban and Haqqani, we did not do that. We could not supply Afghan Taliban with weapons, so we allowed the supplies into Afghanistan where Afghan Mujahideen robbed the containers and armed themselves !
Of course, NATO also used this supply to arm TTP and occupy Afghanistan but unless Pakistan decide to eject the foreign forces from Afghanistan, the only way to deliver weapons to Afghan Mujahideen is NATO supplies :)
If we want to destroy TTP, we must throw the Americans out. Otherwise, just blocking the supplies going into Afghanistan would also block Mujahideen weapons. Yes, we should block the route coming back from Afghanistan to Karachi and seize all military hadrware which US is trying to take out. That is our war booty :)