David, this is not stated as an ideal or hypothetical perfection. This says that marriage *between a man and woman* “is essential…” (not “for the best” or “preferred”), and that children are “entitled” (way beyond “ought to be” or “supposed to be” or “we’d like it if”) to birth within this kind of family. Yes, one must have faith in God and in his living prophets to see the Proclamation on the Family as proof that “traditional” family units can do a better job raising children than same-sex couples. That in no way weakens it as an element of proof.