AP Photo

Frustrated sons of privilege, caught between East and West, sometimes make for dangerous militants. Mohamed Atta, the lead 9/11 hijacker, was the son of a Cairo lawyer and the grandson of a doctor. The so-called underwear bomber, Umar Farouk Abdulmutallab, is the son of a wealthy Nigerian diplomat. Faisal Shahzad, too, appeared to be a fairly secularized, Westernized Pakistani. His father was once a high-ranking official in Pakistan's Air Force, and Faisal had become a U.S. citizen. But unknown to many who knew him superficially, his life was riven by tensions that propelled him toward terrorism.