Yet another study of suicide bombers was published recently, this time by researchers at the University of Toronto. Like almost all its predecessors, the study refuted the theory that such bombers are motivated by poverty and despair; most, it found, were not economically deprived. It also echoed previous studies in concluding that suicide bombers are not psychologically unstable. More than 200 Iranian men and women volunteer to carry out suicide bomb attacks against Americans in Iraq and Israelis in 2005. Photo: Associated Press , AP But, again like many of its predecessors, it stopped short of the obvious conclusion: that...