The overwhelmingly liberal tilt of university professors has been explained by everything from outright bias to higher I.Q. scores. … A pair of sociologists think they may have an answer: typecasting. … The academic profession “has acquired such a strong reputation for liberalism and secularism that over the last 35 years few politically or religiously conservative students, but many liberal and secular ones, have formed the aspiration to become professors,” they write in the paper, “Why Are Professors Liberal?” That is especially true of their own field, sociology. … To Mr. Gross, accusations by conservatives of bias and student brainwashing are self-defeating. “The irony is that the more conservatives complain about academia’s liberalism,” he said, “the more likely it’s going to remain a bastion of liberalism.”

More here.  “Shut up about this imbalance or it’ll be worse.”  Can you imagine a sociologist recommending this response to a huge imbalance elsewhere, say a [disapproved] gender, ethnic, or sexual preference imbalance among executives, top colleges, country clubs, or political offices?   But when it comes to imbalances in their own profession, …  HT Tyler.