The Pashtuns are unconquerable people. We can only pray for the Tajiks and other minorities who are destined to live under their tyranny.
While I never know if you're serious or not, there's some truth to that. You can never win a war until the enemy considers themselves defeated. The Pashtun people seem unwilling to give up. And considering the half-hearted effort we've made, the terrain, and the long history of the Graveyard of Empires, they have good reasons to be optimistic.
Look at Pakistan. The Punjabi majority lives in fear of the Pashtun minority. (perhaps this is a slight exaggeration, but in practice, it's not that far from the truth imo) There are about as many Sindhis as Pashtuns in Pakistan, but they are nowhere near as politically relevant as Pashtuns. FATA is the most terrifying place in the world for an outsider other than perhaps Somalia outside Mogadishu.
Who are the Pashtuns, anyway?
The Pashtuns are a tribal ethnic group native to Afghanistan and northwest Pakistan. They are the dominant ethnic group in Afghanistan and one of the two main minorities in Pakistan. Generally speaking, they have fiercely nationalistic and militaristic traditions. I suppose you could compare them to the Japanese in that regard.