Diogenesister - This is not a USA vs. Europe thing. A masters or PhD from any real university is an academically rigorous degree.
We are not just talking about converts that already had their degrees before becoming a JW. This affects born-ins and raised-ins as well, even more so. Many of these folks do go to university, (I did), and what happens is the programming is already well set in by that time, so it is easy to remain in, as one can treat the experience as "necessary business". Remember JWs that do go to university are going for career purposes, not to be enlightened in the general sense, so it is easier for them to have a rather disengaged viewpoint to the experience, even though they may perform well academically. Compartmentalization is the result, unless one is already having doubts.
University educated people have a greater degree of success in aggregate than non-university educated folks. Successful people have higher levels of self-esteem, and generally work to preserve that self-esteem. If something stands in the way of the ability to maintain a healthy level of self-esteem, (such as being wronged in a judicial committee, divorce, etc.), this will lead a successful person to often see things as they really are. Those experiences can happen several years into the future after one's education is completed.
d4g