You have to be careful not to conflate all Pashtun or even all Tribal Pashtun with the minority that joined the TTP. And the blame for so many joining the TTP also lies across the board, not just with the people of the Tribal areas. In my view, the power structure in the Tribal areas was ready for a strong, brutal entity like the TTP to step in and overthrow. The Tribal leaders were targeted one by one and the TTP, in contrast to the fractured tribes, was able to put up enough unified force in specific areas to overrun any local opposition. Even the pro-government Lashkar's were not always able to ward off the TTP long term without Army assistance.
That said, I don't agree with giving the PTM an ounce of sympathy or understanding - they are, as I mentioned in my earlier post, an ideologically racist and separatist movement that see themselves as closer to Afghanistan than Pakistan, and no amount of development and uplift in FATA is going to change racism - that is who they are and who they will always be. The focus should be on making sure that the number of Pashtun the PTM can exploit in support of its cause is minimized as much as possible, and with those ordinary Pashtun, it IS development, reconstruction and uplift that will make the difference.