If we were allowed to do what needed to be done, it would be over, and rather quickly at that.
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The problem with saying if we were allowed to do something, is in defining what that somethings is. Which Sinsear seemingly forgot to do.
But let me guess, is that something going into Pakistan and cleaning out Al-Quida and the Taliban?
If so, why should that do anything to correct the mess we have already made in Afghanistan? And in fact it could be a big blunder that just widens the war and spreads Nato even thinner than it is now.
After all most of Al-Quida and the Taliban are light years less technologically adept as Nato, but they are every bit as intelligent as Nato and are mostly far advanced of Nato in knowing the local culture and politics. And the Afghan insurgency has learned much since they were cornered at Tora Bora, they are unlikely to commit that blunder again.
Somewhat the fantasy goes, the combined forces of Nato and the Afghan army should go chase the Taliban and Al-Quida on through Pakistan until they finally reached some edge where they can retreat no more, and have to stand and fight the set piece battle Nato is excellent at, and then presto, the Taliban and Al-Quida problem is solved and thereafter its nirvana.
Its a nice fantasy, but it will never work, first of all there are other escape routes into the Stans to the North, second, as Nato marches ever forward into the distant horizon,
the Taliban and Al-Quida will simple sneak back around Nato, and while Nato forces march off into the distance, they can go back home to Afghanistan and find even fewer Nato troops.
The other thing to say is that is the military thinking, but that is not what is needed because Afghanistan is a military occupation, and the thinking and methods are different.