There are a couple of books on the CIA and special forces operations on Afghanistan prior to the invasion. You can see how with some dozens of guys on the ground, some air superiority and some millions to buy loyalties, they had Afghanistan under control in 2 months.
The problem is that the Army and the Marines wanted their part of the cake (National revenge and of course the glory), that pressure from the pentagon is what forced the invasion and the current situation.
Most Afghanis wanted a change from the Taliban, they were ready to support a different Afghan government, the problem is that they hated even more a foreigner hanging around with tanks at their homeland that they hated the dumb and abusing Taliban.
The problem is that the Army and the Marines wanted their part of the cake (National revenge and of course the glory), that pressure from the pentagon is what forced the invasion and the current situation.
Most Afghanis wanted a change from the Taliban, they were ready to support a different Afghan government, the problem is that they hated even more a foreigner hanging around with tanks at their homeland that they hated the dumb and abusing Taliban.