The fact that Pakistan and Pakistanis are directly affected by a perceived 'illegitimate' war and invasion of Afghanistan, that has severe repercussions for Pakistan, would be one reason.
Radicalization of Pakistan began when Zia govt and CIA arm in arm used the Madrasas of NWFP to turn Afghans and Pakistanis into militants and extremists in their fight against soviets.....
Both govt provided arms to these folks and ingrained the idea of freedom through violence.....
So the process had its roots well before the WOT even began....
Now the point is, the tactics used to make an Afghan refugee Mujhideen were also used by Zia in Pakistan itself......
So a person studying in an A-level school probably had enough space to be liberal, but same cannot be said of the Govt. educated.....or those that attended Madrasas....
Fast forward to post-9/11.....had the US not attacked, Afghanistan, the largely lawless region of NWFP which largely remained a hotbed for such fundamentalism would have continued to simmer in such volatile teachings.....Inevitably, this would have blown over to the rest of Pak as well....luckily Pakistan did get involved in the fight curbing the spread to a WOT as opposed to an Islamic Revolution similar to Iran.....
So to blame it solely on WOT is not accurate....especially in light of past faulty policies of the GOP and its dictators.....
I think the root of the problem was education....
Let me ask you something.....
What are the prospects for a Madrasa educated person in Pakistan?
But beyond that, as far as terrorism and extremism is concerned, terrorism in the UK is not limited to British citizens of Pakistani origin, as has been pointed out, and the radicalization of most British, of Pakistani origin or not, occurs in Britain, not Pakistan.
I never said it was a purely Pakistani phenomenon in the UK....though Pakistani youth in the UK are more susceptible to it......