Understanding Jihadi Networks / Strategic Insights, Center for Contemporary Conflict, Naval Postgraduate School, 2005

http://www.ccc.nps.navy.mil/si/2005/apr/sagemanApr05.asp
"Conventional wisdom offers up several explanations: terrorists are a product of poverty and broken families; ignorance; the lack of skills and opportunities; thelack of occupational or family responsibilities; weak-mindedness and vulnerability to brainwashing; mental illness, psychopathy or sociopathy; plain criminality; religious fanaticism; or simply evil."