Sometimes the courts completely buy-in to cultural prejudices and no amount of facts or reasoning can sway them otherwise. We see that in Dred Scott & Plessy v. Ferguson. The same arguments that lost in Scott & Plessy would prevail in later cases.
Here arguments supporting traditional marriage are simply dismissed as were the arguments in Scott & Plessy. The idea there is no rational reason to support traditional marriage other than animus is absurd on it's face. The court demonstrates as it did in Scott & Plessy that it is not immune from cultural madness.
What is that old saying, "Those whom the Gods destroy they first drive mad."