The statement is sound throughout, but this paragraph seems especially well-reasoned:
For centuries, parents of adopted children have been acknowledged as legal parents. And we warmly commend the generous practice of adoption. But this was understood as a humane exception to the more fundamental rule of natural descent. Today, however, the most basic principles of family life are being reconstructed around exceptions. Because the male-female difference must be erased to make way for same-sex marriage, the procreative potential of the male-female union must be set aside as well. A child’s parents are whomever legal documents designate as Parent 1 or Parent 2—or, as California documents now allow, Parent 3 or Parent 4. Thus, children are exposed to the risk of coming into the world as strangers, in which the biological ties that form the natural family are arbitrarily broken. The law no longer recognizes the primordial, complementary natural roles of mother and father. The natural family as the fundamental context defining where we have come from and who we are is set aside. The family becomes a creation of the state, and where the family is a creation of the state, children become, in important legal respects, the property of the state.