Hon Shaikh you do have a point. However let us examine the situation.
Just assume that some miscreant for whatever the reason; throws stones inside your house, runs aways to hide with your neighbour. This goes on on a regular basis. What options do you have??
You can either ask your neighbour to hand over the culprit or be ready for retribution or if you are weak, you sell your house and move away.
Situation in Afghanistan / NWFP is the same. If PA does nothing, US will bomb. Pakistan doesnt want her citizens to experience 'Daisy Cutters' so instead is telling US/Afghanistan that PA will root out the miscreants on their own.
Problem is not however this simple. Even before the 9/11, Pakistan had a severe sectarian problem. Sepah Sehaba and their supportes would like Pakistan to be declared a Sunni Wahabi state and were killing Shia doctors, Iranian engineers and cadets simply because they were Shias. Shias were then bombing Sunni mosques and killing Sunni scholars in revenge. The problem was acute. ( Hope you dont have such short memory that you have forgotton Momenpura, killing of Maulana Farooqui and Tariq Azam).Would any State tolerate dictation by a small group of brainwashed zombies??.
Now sectarian activists have combined forces with Afghan Taliban and hurting the foundation of Pakistan state. Do you have no love for your country that you condone these barbarian acts in the name of Islam but blame PA for returning the fire?? This fight is not for US alone but for the survival of Pakistan herself. Else Pakistan would be like Somalia in no time. Would you like to live in such a hell hole??
I am extremely worried when educated Pakistanis blame PA and the government for every thing but justify these brutal killings. What has compelled these misguided thugs is promise of instant entry to paradise by killing the infidels. They are however not killing kaffirs, they are killing their own countrymen. According to Islam, suicide is 'haraam'. Show me a single Hadith or any Quraanic verse which allows taking your own life under any circumstances.
Syed Qutub was the first mulla who argued that when all else fails, suicide is justified. Would you follow the Sunnah of the holy prophet or a fatwa by a mulla??
My friend, suicide bombings cannot be justifed under any circumstances specially against your own countrymen. Any one who thinks otherwise is seriously misguided.