Once again, you seem to be able to find all these "noble" reasons to support gay marriage but all those "noble" reason would also apply to polygamy. You don't fix hetero marriage, which you claim is broken, by introducing gay marriage. That's an illogical response.
We don't CARE about the stability of gay couples. They mean nothing to society.
Hmmm--well I have to respectfully disagree with your position. I think EVERYONE matters. If a gay or bisexual person were to discover a cure for diabetes or heart disease or cancer, would you refuse to accept it because you would be "supporting" the gay lifestyle or contributing to the idea that gay contributions to society have value?
With respect to polygamy: By nature I don't like to be judgmental about whatever love relationships people enter into. I think God is more qualified than I am to render final judgments and I am content to leave it in his hands.
I do, however, agree that the most vulnerable and powerless among us (children, disabled or enfeebled, etc) should be protected from predators (whether sexual or any other kind).
My major concern is that I prefer the least government intervention possible in our private lives because I don't think government has the wisdom or restraint necessary to make the best decisions involving human intimacy.