2) You're posting a whole bunch of binary choices. People get married and divorced for lots of reasons - not simply lack of "commitment". My dad knew a couple that lived together for 15 years (and had kids IIRC) and then got married. Why? Health insurance. Similarly, sometimes there are sensible financial or reasons other than "commitment" why people get divorced. E.g. People often change after a few decades and want to do other things with their lives. People who make those choices aren't somehow, (probably the wrong words here) morally defective.
3) Just because you don't understand why people would make other choices doesn't mean that their choices aren't legitimate. People are different and have the right to make choices that are sensible for them. If someone wants to be married, and they don't want kids, and they end up getting divorced 20 years later, they aren't somehow worse people than people who don't marry, do have kids, and stay together for the rest of their lives. You can't determine anything about commitment from the two cases - you can have a cowed spouse and a wife-beater in either case. You don't know. They've simply made different choices about marriage.
4) Having some paper that says you've got Durable Power of Attorney and so forth for your family member is supposed to be legally sufficient in many cases, but in practice it isn't always. And even in cases when it is, it's a hassle in terms of time and money. (Personal experience here with J's parents.) If "marriage" means something different for hetero couples than for gay couples, then "civil commitment" isn't good enough. Separate but equal isn't. We've got lots of history showing that to be a fact.
Society should let people make their own choices and not say they can't. Treating people equally is just and more efficient.
What I agreed with most about Hugh's post was:
My point is that two people in love who publicly and ostensibly permanently define their relationship, should have exactly equal rights and liabilities with respect to family identity, property, and tax laws.
When are you going to finally accept the brilliance of my arguments?!?! ;-)
Cheers,
Scott.