Children that are raised in a home with a married mother and father consistently do better in every measure of well-being than their peers who come from divorced or step-parent, single-parent, cohabiting homes.
If you walk down the street and see someone in a box, you have a choice. That person is either the other and you're fearful of them, or that person is an extension of your family. And that makes you at home in that world and not fearful. So really it's very self-serving.