because it is forbidden in Islam to be nationalist and the talibans was very extreme when it came to religion. pakistan had no military presence in pashtun areas back then, and didnt restrict them from going freely around in those areas. this is which will change in time, since both Afghanistan is having a real government and Pakistan have increased its military presence in Pashtunkhwa.
It isn't forbidden. Early contemporary Islamic leaders made very much use of nationalism, such as Nasser. Since then, after the failure of such Pan Arabic, Islamic movements, nationalism has been viewed with utmost suspicion, leading in part to the rise of religious fundamentalism. That's why nationalism isn't bred strongly. On the other hand, Afghans do have a strong sense of nationalism, coming from years of invasions from various powers, Britain, the USSR, the US.
yes, based the fact it would be easier to remove the talibans by nationalism.
No it isn't. The aim of the Taliban differs, when you consider the Afghan and Pakistani branches of the group. A key distinguishing factors between the two Talibans is that the Afghans insist they have a strictly local agenda of liberating their homeland, many analysts say. Beyond that, they would prefer to be left alone.
In contrast, the Pakistani Taliban has embraced al Qaedaâs vision of pan-Islamic rule, and it has increasingly targeted the Pakistani state instead of helping its Afghan brethren, aiming to set up an Islamic Caliphate so to speak.
A Pakistani Taliban spokesman, Muslim Khan, has said that his organization aims to establish a strict fundamentalist Islamic system, not only in Pakistan, but also throughout the world starting from South Asia
but the fact is, that the taliban will be easily defeated if Pashtunistan is created.
No it isn't. The Taliban is a bizarre mix of both Pashtun tribal culture and strict Islam. Giving them a state will only allow them to consolidate power further, much like how the West fears what the insurgents will do in Mali now.
In any case, Pakistan will never ever give up territory unless by force.