“National service will hopefully become one of the themes of the 2020 campaign,” declared Pete Buttigieg, mayor of South Bend, Indiana, and up-and-coming Democratic Party presidential candidate. Why? Talking to MSNBC’s Rachel Maddow, Mayor Buttigieg offered: “we really want to talk about the threat to social cohesion that helps characterize this presidency, but also just this era.” Oh, goodie, another threat from which the wannabe wizards of Washington can save us. “One thing we could do that would help change that,” announced Buttigieg, “would be to make it, if not legally obligatory, then certainly a social norm that anybody after...