That's a bit generalizing. This paper[1] talks about the over-representation of engineers in violent Islamic organizations. Specifically talks about how there are fewer engineers in Saudi Arabia and Indonesia versus Palestine and other countries in the same type of groups. There seems to be /some/ correlation between economic opportunity and sub-segments of the population joining these types of groups.

[1] http://www.sociology.ox.ac.uk/materials/papers/2007-10.pdf