There are two streams of higher education a person can pursue. One of the Arts (including studying Art literally, Literature, Philosophy, history etc.) and vocational higher education for those desiring to move into medicine, engineering, law or education. Unfortunately, those studying the Arts generally will find conjecture due to the very nature of the material considered. For example, why is one work of art a treasure and another trash. The answer is found in personal and public opinion. The same goes for the valuing of ethics and social justice.
On the other hand, the calculation of load factors in bridge design is another issue all together, in that the answer is correct or not. And the same goes for the application of therapeutic techniques on people who are seriously ill ... or past legal judgements that act as precedents.
However in my experience, Professors, Doctors (those holding a doctorate) and other lecturers have proved to be very approachable and easy to question, even during a lecture. Of course no one will respond favorable if he is heckled by an argumentative student ... and neither would I, once I'd gone the hard yards of academia and personal practice.
In regards to employment, well that's another story all together, in that I've seen many students choose undergrad courses that will lead nowhere. As we know, you can study KLINGON at the University of Texas in Austin, if you like ... but I don't think that your chances are good in earning a living at speaking it.
no zombie