@zraver
One has to comprehend the Pakhtoonwali, It involves their honour code and traditional lifestyle of the Pashtun people. Communal or tribal identity and loyalty, living up to their word, protection to their 'guests' is a very powerful cohesive factor and they are a very unforgiving people prone to revenge even for small slights. In India and where I live there are many Pastuns, popularly known as Kabuliwalas. They are dry fruit vendors and money lenders and woe be to anyone who does not keep his word. The Indian Nobel Laureate, Rabindranath Tagore wrote a very moving tale, "Kabuliwala" emphasising their sense of keeping to their word, capability of revenge irrespective of consequences, their bonds amongst themselves and to those they loved and swore bond with.
While Pakistan Army would have razed the countryside and had no remorse, the Pahtuns will still bear a grudge for the Drone attacks and will never forgive. To them, the biradri is most important notwithstanding who amongst them has flouted the law or norms of society as we see it. Their idea of societal bond and tribal law is totally different from ours.
Ghayrat (self honour or dignity) is paramount for them and if even one of their own is attacked, they will not take it easily, actually they will never forgive.
It is everyone's wish that the ISAF and the US is successful but it shall be a long haul. One really does not know what is the answer, given the Pashtun psyche. They can't even live at peace with themselves, let alone with non Pashtuns.
The British were no fools to leave them to their way and only having a nominal control over them!