Why teach Plato to plumbers

This article starts with a subheading of "Liberal arts and the humanities aren't just for the elite." Scott Samuelson explains to us how liberal arts affects people in the job field. He is saying that liberal arts is not just for college student by metaphorically saying that even plumbers need a liberal arts education. Liberal arts is one of those subjects that literally has everything to do with every single job field in the world. Everyone, including people who do not work, needs to have some education in liberal arts because it is basic knowledge.