The recent revelation of secret material about the state of war in Afghanistan was both astonishing and unsurprising. That WikiLeaks could obtain 92,000 classified documents is absolutely jaw-dropping. Apparently, there's a huge problem with information security in the United States military.
What isn't surprising is the contents of the documents. Everybody knows that the situation is dire. The Afghan Army isn't anywhere near functional, President Karzai and his government are corrupt, and Pakistan is playing a double game, both aiding the United States and Taliban simultaneously. Normally, I'd say there's not much America and its allies can do there, and that troops should be pulled out, with each country focusing its anti-terror efforts on its own gates - seaports, airports and border crossings on land. But the situation isn't normal. If Afghanistan falls to the Taliban again, nuclear-armed Pakistan will quickly follow. Nuclear arms cannot be allowed to fall into the hands of terrorists.
The two Talibans of Afghanistan and Pakistan are not the same, though they're linked. The Afghan Taliban is only concerned with Afghanistan itself. Their Pakistani counterparts, on the other hand, have a much more global outlook. Imagine these international Jihadists with nuclear weapons. They'd be a much greater danger than even a nuclear Iran could ever be.