When I review divided appellate-court decisions, I almost always read the dissenting opinions first. The habit formed back when I was a young law student and lawyer—and Federalist Society member—in the late 1980s, when I would pore (and, I confess, usually coo) over Justice Antonin Scalia’s latest dissents. I came to adopt the practice not just for newsworthy rulings that I disagreed with, but for decisions I agreed with, including even obscure cases in the areas of business law I practiced. Dissents are generally shorter, and almost always more fun to read, than majority opinions; judges usually feel freer to...