By Giuliani's own criteria, the United States is barely a step above a dictatorship. With all this nonsense arising from the WTC attack, that step is growing shorter and shorter everyday. It's akin to handing over your credit card to a thief who uses your wealth to purchase the tools he needs to break into your house. Even if the Taliban did force a cutback in what their people could farm, they are reputed to have large amounts of the poppy paradise goods stockpiled. As others have suggested, if we really want to hurt the Taliban and bring them to their knees, perhaps we would be better off simply re-legalizing currently illicit drugs than sending in our troops to die.
Money fuels the terrorism machine.
While we do, of course, need to attack the symptoms, i.e., the individual terrorists and the governments supporting them, we will be better off in the long run eliminating the foundations that feed those direct problems. Remove the profits from drug production and remove the power that is derived from that illicit wealth. Kill as many of these terrorists as we can. Everyone but the statists and power-mongers will benefit. More freedom is good for you.