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Suicide bombing is a corporate effort: in this respect, the closest historical analogy may be the kamikaze pilots who trained as a cadre to terrorise the American fleet in the Pacific in 1944-45. And suicide appeals to these groups principally because it is a good way to kill large numbers of people. Robert Pape, of the University of Chicago, calculates that between 1980 and 2001 13 people died on average in every suicide attack, whereas just one was killed in other terrorist incidents\ufffdexcluding September 11th, which would make the death ratio much starker. For those whose aim is maximum destruction, not just maximum publicity, it is the natural choice.
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It's a good read.
Cheers,
Scott.