In recent months, Christopher Scalia in the Wall Street Journal and Fareed Zakaria in the Washington Post have defended studying the liberal arts in college, primarily to confront advocates of science, technology, engineering, and mathematics (STEM). Zakaria’s article previewed his new book, “In Defense of a Liberal Education.” From my perspective as a former engineer, two caveats arise regarding their pleas: first, “liberal” education that involves “critical thinking” disappeared decades ago, to be replaced by hyper-sensitive grievance mongering; second, the quantitative reasoning STEM occupations develops also facilitates the understanding of trade-offs people need to make rational decisions among myriad conflicting...