As I see it, the fundamental reason for occupation is/was to deny the extremist factions of certain religions being able to freely train in all things terror. These people are normally one of two types; Criminal factions looking to further their personal ends or proper fruitcake nutjob religious zealots who will not rest until only people of a certain religion exist in the world and the rest have converted or are dead.
The poppy growth is absolutely down to Terry nowadays as they are the ones who buy it, do not try to pretend otherwise. TJ, there are people to whom the terms pakistani and afghan mean nothing neither do borders, so there is often little distinction. Ernie, the beeb can try to spin it how they like but terms like
Troops were backed by rockets and US bombing
are not really refutable.