After an early bureaucratic disaster - the feds banned private-sector tests and failed to deliver a test that worked - the U.S. has ramped up testing to astronomical levels, dwarfing the rest of the world and any historical comparison. We average about 1.5 million tests per flu season, and we've now run over 57 million tests for COVID-19. But have all those tests delivered what proponents of mass testing promised? Have they contained the spread and restored public confidence that infectious people are at home, not out and about. Absolutely not. In fact, by the time most test results are...