I've read that engineers and scientists, or students of those disciplines, are disproportionately represented among jihadists

I've also read this, but I want to know if it corrects for the fact that the educational systems in many of the countries that produce most jihadis don't encourage study of the humanities and certain social sciences. Is it really engineers in particular, or is the educated-but-stifled who happen overwhelmingly to be engineers in these countries?