My friend, you appear to have a very poor grasp of the Pashtun mentality ! Were the Afghan Taliban our stooges the last time out the Durrand Line issue would have been done & dusted.
Pakistan wants its interest to be protected viz a viz Afghanistan for whatever happens in that country inexorably effects us ! If their is a civil war there...we suffer as an equal party to the conflict even when we're not ! And it goes without saying that Afghanistan has been hostile to us from Day 1...we'd rather have our backs covered.
We didn't support the Taliban because we agreed with them ideologically but because out of expediency ! Here we found ourselves with a war ravaged Afghanistan where whole generations had known nothing but death & destruction; when the time came for the International Community to rehabilitate the country, to give them some semblance of a future...something that takes the Ak-47 out of the hands of a 13 year old & instead sends him to school...the turned backs on us ! We were left with a few million refugees flooding our cities, a war torn Afghanistan going through a period of civil war where all them former Mujahideen with their personal armies now becoming warlords of their own realms & fighting each other for more power, more influence in a country that was is chaos. Our actions were a reaction to that situation; Pakistan saw an opportunity in a group of people (the Taliban) who were not only amenable to Pakistan's interest & friendly to us but also, being mostly Afghan refugees, the ones who had suffered the most due to all that infighting. Yes their puritanical version of Islam was potentially problematic but at the very least their presence in Afghanistan insured that the infighting had stopped, that with proper aid to the Afghan Government the rehabilitation process could start. Unfortunately our attempt to make the best of a really foOked up situation didn't pan out the way we wanted it to with the introduction of the Al-Qaeeda in Afghanistan & what was once a localized puritan movement not only got extrapolated to the global stage but also got even more radicalized !
It didn't turn out the way it was hoped too but thats what happens in damage control...how the hell were we supposed to plan a contingency for the Taliban allowing people in who'd after a while take a foOking plane & ram it into the World Trade Centre ?