I used anti-miscegenation as a stand-in, as an example of a ludicrous, indefensible position to hold today, while there are still holdouts who apparently think that gay marriage is some sort of affront to the moral fabric of society.
State-declared marriage is an tax saving scheme, that the state does in expect for future tax payers. Not granting it to people who won't "produce" tax payers seems entirely reasonable to me.
Oh okay, I see. It is wild to see how much things change because amongst my generation your analogy makes sense, but at the time prop 8 was passed by a majority of Californians.