Those are certainly virtues to admire and encourage in any way possible. How do we best do that? It doesn't happen naturally. It requires civilization, it requires institutions that help to pass morality from generation to generation.
Institutions change. Slowly. This push for gay marriage or unions is well-intentioned I'm sure. But the push is well-intentioned (and high-powered) political maneuvering by people who have no idea what makes civilizations tick.
Institutions must also have an ability to resist change. I do not wish anything bad for those 4% of the population who are gay. But this is not a healthy change for the institution of marriage itself. In my opinion.
First of all, don't put single parents who became that way through no fault of their own with single people who chose to become single parents, or homosexual couples who chose to become parents. Involuntary single parents deserve far more encouragement and support than these other groups, who are making selfish choices. In fact, even single parents who became that way out of a confessed mistake deserve more support; at least they're likely to be teaching their children differently.
Secondly, because of the known disadvantages of single or homosexual parenting, giving government sanction to such family structures would mean the government is doing a disservice to the many future children of these families who would not otherwise have been. Those who already are in such families might gain some limited benefit, but I think the costs outweigh the benefits.
The children need to be supported. The homosexual couples don't.
Gays raising kids is bogus, and agencies that let gays adopt are letting their wards down. Individual gays may be capable of raising a kid properly, but will they want to? Can you tell me in good faith that liberal, out, committed gays will pass on to kids any but their own gay paradigm as a worldview? They couldn't, without being total hypocrites, and I doubt that any of them would bother to try. So how do gay parents raise straight kids to be straight? Or do the straight kids raised by gays wind up having a much, much higher rate of homosexual accommodation and bisexuality than straight kids raised straight in straight families that impart traditional mores?
I think you know the answers to those questions. Gay parents can't, they wouldn't, and they won't raise kids to be traditional straights, but gay-friendly "reconcilers" instead, imparting the countercultural gay Weltanschauung to kids who would otherwise have a straight one.
Result: queer kids who merely "prefer" the opposite sex.