Academia definitely leans toward the liberal. Probably has something to do with free thinking, which conservatives seem less tolerant of. However, in regards to the above examples, they're just a cherry picked batch of left wing academic proselytizing. With a little work, a batch of right wing examples could also be had. Admittedly, more left wing than right wing examples will generally occur in the academic environment, but neither side has a monopoly on proselytizing.

When I was a kid, right wing propaganda was more common in public school. Maybe because Eisenhower was Prez. Times change.