I question the desire for some to instruct others in something they know nothing or very little about.
Have you attended or sat in on a College level course at a University lately? Your same question kept me up for several nights after visiting University of Colorado, Boulder!
My biggest critique of my college professors is that the majority are not experts in their field. This is a major stumbling block to their students, learning is hard enough when you have a good teacher, an incompetent one is drain on themselves and their students.