What difference does that make? As we've seen in USA, a job that has always been filled by career politicians or soldiers has been filled by a man famous for be

What difference does that make? As we've seen in USA, a job that has always been filled by career politicians or soldiers has been filled by a man famous for being on tv. On the other hand this guy was in a relevant position. Is being a former professor of criminology different to currently being a professor?