Neither can all men, the important thing here is to make sure that right people are in the right jobs, and anybody who had the qualifications can serve in whatever position they are best suited for.
Now, Mary Kate said, " What if a person is very well suited to having a certain role, like the role of being a janitor, but wants something else, wants to reach higher, wants to choose another way of life? "
While Fourth has recently had a very splendid law library opened, that isn't particularly relevant for you, and I think you'd find Haynes' general university and faculty collections better suited to your needs.