On a natural level, marriage is a committed relationship which forms a stable environment for the fostering of children, care for others, and fostering of communal life. While this natural institution may have its challenges, imperfections and difficulties, it has been the most basic and foundational component of Western civilization for thousands of years. The very challenges marriages face can provide children an important instruction in love, perseverance, reconciliation, and accommodation of others’ needs.
On a supernatural level, marriage between two baptized Christians can become a Sacrament in which the love of husband and wife witnesses the love of Christ for his Bride, the Church. Accordingly, the mutually complete self-giving of spouses for each other manifests the self-giving of Jesus on the cross.
When marriages decrease, we lose both the natural and supernatural benefits for humanity. While no marriage is perfect, the institution of marriage remains foundational.