If anybody's interested and hasn't seen it, Vice did a very good documentary on what the reality on the ground in Afghanistan is actually like:
Highlights include US Marines trying to teach Afghans why eating with the same hand they wipe their ass with is a bad idea, trying to get local tribesman to ease off on fucking underage boys, and many scenes of slapstick-esque shenanigans involving the Afghan "army" (there's a part where they're faced with the intense conundrum of how to remove a Taliban flag from the top of a tree. First suggestion? Let's bazooka the tree).
It appears that a significant part of that particular population can't and doesn't want to be helped. The Taliban will take over again once the allies withdraw, whether that's tomorrow or in 10 years.
Afghanistan also isn't the problem. It's unimportant. Look at the people in this documentary, if you think they're competent enough to organize international terror attacks, you're a fool. The enemy was in clear sight immediately post 9/11. But instead of bringing the Saudis to their knees, the US went for Iraq and Afghanistan. IMO, the wars that were started post 9/11 (and the war that wasn't started) remain the biggest blunders on the international scene post WW2. What's perhaps worst, is that it was clear what was actually happening, who was really the target, and yet everything proceeded as per Cheney's and Rumsfeld's plans. The fact that these two haven't been brought to justice is mind boggling.