That's an well-written and well-thought out article; thanks for posting it. In general, First Things is a favorite "worthy opponent" on many of these types of issues.
I'll quote the author's own eloquent words:
I could not agree more. Free people must be serious, educated, and sincere in their pursuit of moral good, if they are to be the best possible actors in both the political and economic spheres. The gay rights movement, like emancipation movements prior to it, exemplifies this type of excellence. These movements, when countering majority prejudice, redeem democracy by first speaking and then voting truth to power, while the superiority of their moral message gradually persuades the larger polity to change their thinking. Powerful institutions, in the case of the gay rights movement, the Church, may stand in violent opposition to such changes, but to the degree that the minority has the ability to appeal to the angels of the citizens' better nature, decency does sometimes overwhelm that prejudice.
The Church has a problem: it is morally wrong on gay rights. This is a wrong that has haunted the Church from the days of the Patristic Fathers, and it is a gross violation of Christ's principles of love. Why the Church got this way is a question for historians and philosophers, but institutionally it has a lot of growing up to do. Hopefully it will take its evolution on the question of democracy itself to heart. There was a time when the Church condemned democratic movements and upheld divine right monarchy. For at least a century it was an impediment to the development of the very community of love that it wishes to see. Eventually, it pulled a 180. With time, it will do the same on women and then finally, once it has purged its own demons, on gays. It won't happen in this century, but it will happen.
In the meantime, at least it's on the right side on poverty, and frankly that's a much more significant problem facing the world than whether Adam and Steve have to get married in a courthouse rather than a church.