I think this explains a lot. Many sociologists, for example, seemingly do not understand exactly how far to the left they fall and, subsequently, why people who do not share their intellectual space not only don't understand them but reject them. The same can be said for other disciplines.....but especially those (fill in the blank) studies programs.
Diversity is more than skin color and gender. It involves people with different but sincere opinions and view.
You can read an excerpt of the study here