President Trump proclaims his tariffs will bring manufacturing jobs back to the U.S. Good luck finding workers to fill them. A common lament among employers, especially manufacturers, is they can’t find reliable, conscientious workers who can pass a drug test. Single women might commiserate: A good worker, like a good man, can be hard to find these days. Blame government, which showers benefits on able-bodied people who don’t work while at the same time subsidizing college degrees that don’t lead to productive employment. The result is millions of idle men and millions of unfilled jobs—what an economist would call a...