Upvote:2
Osama bin Ladin was found and killed in Pakistan, one of al-Qaeda's alleged senior operatives, Adam Pearlman, is an American citizen that is supposed to have joined al Qaeda while in Pakistan, the US Department of State recommends US citizens avoid Pakistan for all but essential travel due to terroristic threats, the 2008 Mumbai attacks were carried out by Pakistanis, allegedly with the support of Pakistani's ISI, etc.
To put it bluntly, Pakistan is probably seen by some as a terrorist breeding ground.