Diversity argument isn't a total crock?

I've always thought that when people said we need affirmative action to promote diversity they were either lying or deluding themselves. No one actually took the idea of diversity seriously? If they did, wouldn't it bother them that all the students at Harvard are Democratcs, or that whites are underrepresented at MIT?

Maybe, I was wrong. Psychologists are overwhelming liberal. The lack of conservatives in the field biases the interpretation of findings, choices of experiments to fund, and can even drive people to censor evidence contrary to their politics (remember Larry Summers?). This didn't bother anyone because, I assumed no one cared about intellectual diversity.

Here's the story.