Following the recent wave of arrests in England and even Australia, everyone seemed surprised that most of the terrorist suspects were highly educated, some apparently from middle-class or privileged backgrounds. At least two of them had completed their medical training, with one about to become a neurosurgeon.
...
With Islamist militants, however, the sociological dynamics seem to be different. No researcher has yet been able to construct a single profile based on simple socioeconomic indicators that would accurately describe the "typical" jihadist. A senior British intelligence officer summed it up as follows: "The pattern is that there is no pattern."
...
What they share, however, is that they have all experienced tensions in their personal lives, or were faced with deep and sustained crises of identity that they resolved by embracing jihadism.