Most everyone in America was and is in favor of marriage equality. Most everyone was and is in favor of marriage equality because most everyone wants the law to treat all marriages equally. The debate in the United States in the decade and a half before Obergefell v. Hodges wasn’t about equality. It was about marriage. We disagreed about what marriage is. Of course, “marriage equality” was a great slogan. It fit on a bumper sticker. You could make a red equal sign your Facebook profile picture. It was a wonderful piece of advertising. And yet it’s completely vacuous. It...