What you are missing is that the legal and medical communities know that forcing children into same sex parenting will damage them for life and they are okay with that.
That hasn't been tested under oath in a court of law.
The courts explicitly found that same sex marriage benefits children. You are quite simply ignoring the explicit findings of the Supreme Court and replacing it with your imagination.
That's not a legal argument.
Worse, the Supreme Court has found that the right to marry isn't conditioned on children or the ability to have them. You ignore this explicit finding of the Supreme Court, insisting that the right to marry is conditioned on children....because you say so.
That's not a legal argument either.
And if it has and people beholden to the non-scientific entity "The American Psychological Association" now run by a politically correct LGBT mouthpiece (all medical entities look to them on issue of psychology as a reflex) testified, then a re-hearing is in order, using child advocates in court (lawyers for children's unique share in the marriage contract) calling their opposing expert testimonies..
No court nor law recognizes that children are parties to the 'marriage contract'. You made that up. And then insist that your imagination is the law.
That's not a legal argument either.