Brad Wilcox, who heads the National Marriage Project at the University of Virginia and is a scholar at the American Enterprise Institute and the Institute for Family Studies, said the “I’m-OK-you’re-not-OK” perspective on marriage could reveal something about people’s worldviews. Wilcox, who also consulted on development of the survey, said half of kids spend some time outside of an intact marriage, “an indicator that all’s not well” in marriages. That fewer young adults than older adults see marriage as important could portend a future dip in ma...