For example, there used to be a measure to determine "blackness" based on geneological lineage. This was a bad thing because it was used to discriminate against you.
We now do the same thing, it's just we use it so we can discriminate in your favor and against someone else, for some reason this is now a good thing for the PC folks, I think it's just as immoral.
So, shall we have a test for conservativeness so we can decide how to discriminate? What really ticks me off is a Prof's ideology has no place in most classrooms - math, physics, computer science, any engineering curriculum, etc. It seldom came up in my experience, but when it did I was very quick to ask what a Prof's views had to do with learning how to integrate a curve, calculate signal flow in a circuit, or whatever.
It never came up again that I can remember. The problem is the liberal arts curriculums, where perception can't be proven or disproven as easily.
Another question that I didn't include due to length - what about a professor who is fiscally conservative, but socially liberal? Would that make him okay to teach economics, but not okay to teach history? Or vis-versa?