>Your assumption that one of the positions, either liberal or conservative, must be correct, is wrong.

I didn't say that. I said that at most one is right.

I would also say that, even if both are wrong, one is probably wronger than the other.

>Second, the assumption that professors know better than the general population in all cases is also incorrect.

I didn't assume they do know better. But I think we should want them to. Which would imply they should be "biased."