"The author is ending her marriage. Isn’t it time you did the same?” So The Atlantic provocatively introduces its July/August feature “Let’s Call the Whole Thing Off.” It comes at a propitious moment. This seems to be the week for TMI — too much information. South Carolina governor Mark Sanford has told more, much more, than we needed to know about his mistress (how he met her, how their relationship ripened), his views on God’s laws, on the Appalachian Trail, and on forgiveness. Why must wayward American public figures stage these auto autos-da-fé — these self-immolations on TV? Dignity, which...