For sake of argument, I claim that 3-way marriage should not be recognized by civil law. I think you agree with me on this point, so there is no need to argue it. Can we at least agree on that?
Secondly, I claim that there is no “sufficiently good secular reason not to grant legal recognition to 3-way marriage.” Can we agree on this point too without argument?
So you admit that you think that 3-way marriage should be banned by civil law, yet you don’t think there is any good secular reason to do so!
I wonder what else you think should be imposed upon people by law without a sufficiently good secular reason.
This is not an inconsistency on my part because I do not hold your core principle that any granting of marriage should be allowed unless there is this sufficiently good secular reason not to do so.
As I have state many times, my view is that
if civil marriages are widely being offered, then there should be a "sufficiently good secular reason” for the
differential treatment of denying it when it is denied.
Under your approach, you would either:
1 Think there should be no civil marriage.
Or
2 Have a "sufficiently good secular reason” for granting some civil marriages but not others (differential treatment).
Or
3 Have a "sufficiently good secular reason” for granting civil marriages to all relationships.
I was operating under the assumption that you did not choose 1 because you seem to have little or no problem with taxpayers who are in same-sex relationships being forced to subsidize opposite-sex marriages. This is why I made comments in the posts you quoted such as, “If the government is going to offer benefits to most couples,” “Whether there is a sufficiently good reason to offer people civil marriage (together with all of its benefits) to a wide range of people, but to deny some people those same benefits,” “Given the fact that the government already recognizes many relationships as marriages, and grants benefits to those couples,” “justifies offering marriage (along with all of its benefits) to most couples, but to deny it to some others couples.” I think we can both agree that 3 is off the table since people shouldn’t marry children.
So it comes down to 2, which I’d argue is logically the same as my position (given that 1 and 3 are rejected), just in a different form. 2 is really just saying that there is a good reason for differential treatment. If you have a "sufficiently good secular reason” for the government to give better treatment to relationship A than relationship B, then that same reason is conversely a "sufficiently good secular reason” to treat relationship B worse than relationship A. It should be painfully obvious that being given the option of civil marriage is the government treating the relationship better than not being offered that option.
Let’s put this in a context about taxpayers that you mentioned before. You expressed the view that a taxpayer is subsidizing those people who get tax breaks. Correct me if I’m wrong, but you seem to have no problem with taxpayers in same-sex relationship being forced to subsidize the relationships of others, yet have decried that such benefits should not be offered to them in their relationship.
Again, are you making the libertarian argument that a formal State institution of marriage should be replaced by private contracts?
That could be done, but why should it?
My understanding is that civil marriage grants a lot of things you can’t obtain by contracts alone. For example, the right to not be forced to testify against a spouse, immediately gaining parental rights over spouses children (otherwise you have to go through a formal adoption process), the ability to gain residency/citizenship for spouse from another country, and many other things are fittingly granted to married couples but are not granted by contract law (so far as I understand).
Even for those things that can be done by contract law, civil marriage make a lot easier. For example, when your spouse is dying in the hospital, it’s easier to say “I’m married” than it is to present a pile of legal papers. In fact, I’ve heard that many same-sex couples have found that when time is a factor, it’s better to just lie and pretend to be a sibling than present legal documents.