If I am an illiterate and poor tribal man, having my brother got killed in a 'war on terror' would be an event that would make it much easier for someone to brainwash me into doing anything at all.
This senseless killing in Iraq, Afghanistan and Pakistan is what makes one a 'terrorist'.
That is a false accusation against "illiterate, poor tribal". Not all poor/illiterate men are devoid of sense of right and wrong. If I were a illiterate/poor tribal (or no tribal) man I'd pick up the arm (if I don't get justice) but against "army" not against civilians who are trying hard to make ends meet, I'd know more about how tough the life is for a common man, how cruel it'd be to kill someone's only bread-winner etc.