On this Independence Day, let’s go ahead and admit that 2018 has not been the most uplifting year. Since January, there have been at least 23 shootings that left someone injured or killed at a school in the United States. As of last week, at least 2,000 minors separated from their parents were in the care of the Department of Health and Human Services, with no clear path to reunification. The past several months have seen high-profile instances of outright racial harassment and a much-bemoaned downturn in “civility.” Income levels are stagnating, and inequality is soaring. A growing number of...