I clarified in this comment:
https://news.ycombinator.com/item?id=7461745But to succinctly answer your question; no I don't think it is unequivocally libertarian. But it depends on who you talk to.
> I've noticed that libertarians and leftists both tend toward a passionate hatred of compromise and "half-measures," and this reasoning strikes me as one of those cases.
You mean compromise with respect to the expansion of the State. This is usually the distinction between a moderate and a radical.
> I'm dubious that it's a very good basis for opposing gay marriage rights.
Here's the problem: you're presupposing that marriage is a right.
I appreciate that marriage (along with a myriad of other things) is listed as a right in the UDHR, but that really isn't why gays---or others like polyamorous cohabitants---want marriage in the first place. They want it because of State granted privileges bestowed upon married couples. Those aren't rights.
Unfortunately, some of those privileges restrict the rights of all unmarried persons. Particularly with respect to hospital visitation. Everyone---including unmarried people---should be allowed to control such things about their lives.
Other privileges include tax breaks and the like. I won't go down that road...
With that said, you're basically telling me that I oppose something that I don't think even exists in the first place. To me, rights are much more fundamental than constructs like marriage.
The problem is that the debate is framed in terms of gay marriage. One's position against marriage in general can subsume one's position on gay marriage. But the lynch mob lacks perspective and can only imagine that being against gay marriage means being against gays.
Once you finally recognize that, "oh gee whiz, yeah, being against marriage in general is cool, but still, you aren't pragmatic enough for me."
OK. Now we're done. Before I was a bigot. But now I'm just not being pragmatic. That isn't a lynchable offense. So, we good now? (Not talking to you specifically, but in general.)
Disclaimer: I don't vote and don't contribute to any political causes/campaigns because there are none that exclusively support voluntary interaction. If someone put a gun to my head and told me to vote, I'd vote in favor of more egalitarian laws every time.
Sorry for being a windbag, but in this kind of topic, it's just way too easy to take short responses that aren't precise in bad faith.