Apropos of the budding discussion in the comments to my last post, Andrew Sullivan has posted some conservative reactions to the Newsweek piece. One debate in the comments has focused on whether making these arguments is nevertheless worth it, politically, insofar as Bible-based arguments like Miller's might convince Christians to support same-sex marriage. I am skeptical of whether that's the case. But I do think that the comments from Ralph Reed quoted by Sullivan at the link above suggest another possible reason for making these arguments.
Apparently, Reed was angry because he felt the piece reduced religious conservative arguments against same-sex marriage to "some formulaic, scriptural literalism." Instead, there's apparently "more of a practical, sociological foundation for why we seek to affirm marriage."
To this, I say bring it on. Because I think the "practical, sociological" implications are pretty clear here. And if arguments like Miller's throw the scriptural debate into confusion and force people like Reed to make empirical arguments, they might serve an important role. At very least, I think that's one possible case that can be made for putting those arguments out there.