From time to time, just one human story becomes something akin to a modern parable. David French—writer, lawyer, public intellectual—is now that person. It is no insult to say that French, in himself, contains multitudes. In two recent articles, French defends both what is wrongly called the “Respect for Marriage Act” and his own process of thinking about same-sex marriage. He says that he has written these articles as acts of personal intellectual honesty, and I have no reason to question his integrity of mind. What I mean to criticize most strenuously is the ideas he now promotes. I do...