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The article answers this important question and comment in this way:

Why engineers? Everybody's first reaction is that they are recruited for their technical proficiency in bomb-making and communications technology, but there is no evidence for this. A tiny elite tends to do the technical work in these groups, and jihadist recruitment manuals focus on a personality profile rather than technical skills.

So we are left with two hypotheses: either certain social conditions impinge more on engineers than on other graduates, or engineers are more likely to have certain personality traits that make radical Islamism more attractive to them. Our best guess is that the phenomenon derives from a combination of these two factors.

Hope this helps. (Again, note that the authors focus on Islamist extremists, but their conclusions apply more broadly.)

Fred Bortz