Hi akram saqib! How's it going?
Now then, my understanding is that the Taliban represent a particular, fundamentalist interpretation of Islam. Fundamentalism cannot be 'destroyed from the face of the earth.' Indeed, even if it were possible to do this -- and forgive me for resorting to an old ciiche -- but the powers who did that would be shown to be much, much worse that the supposed 'evil' they were fighting. You know that perfectly well, I'm sure.
Second, the legacy of British, Soviet, and U.S. imperialism in the region, is very well known. Additionally, it is my understanding that the Taliban were set up in Afghanistan by the Pakistani ISI (their equivalent to our CIA -- Central Intelligence Agency) because they believed it would give Pakistan strategic depth vis a vis India.
Thirdly, I've heard the Pakistani-British activist, foreign policy analyst, and author Tariq Ali, say that the Taliban resistance (or that leg of the resistance) is largely a movement of Pashtun nationalism. As you know, British imperialism tended to go by the 'divide and rule' strategy, carving up the world with arbitrary lines on a map, for the purposes of efficient administration of their empire, not concern about the people on the ground.
What I'm saying is this: In asking if the Taliban be 'destroyed from the face of the earth' or 'moderated,' what you are, in fact, asking is -- Should Taliban (Pashtun) resistance to NATO invasion of Afghanistan (and by definition Pakistan as well because millions and millions of Pashtuns live there) be 'moderated' or 'eliminated'?
Take it easy.