The end of the debate:
It appears yet again that we are supposed to think that the debates over the great philosophical and moral questions have been settled. This article on Virginia campaigns expresses on behalf of Cato a presumptive commitment to contractual relativism. Without my making any surmised about the real quality of the candidates in question - they really may be bigoted and insane - still the arguments given for this are extremely specious and question begging.
That racists, nationalists, and anti-Semites may appeal to the same language ("intrinsic ends", "natural law") as objectors to same sex marriage does not show that there is no legitimate applications for natural law theory. One can mistake (even deliberately culpably mistake) the meaning and application of natural law theory, especially since their is more than one interpretation of it (Aquinas, Hobbes, Grisez). That such disagreements are possible strongly supports the intelligibility and prima facie plausibility of the view. Comparisons with Nazis are not sufficient evidence especially given how natural law was used against state powers to protect the rights of South American native peoples against exploitation in the 18th century.
Also, while those cited may certainly show ignorance in formulating and justifying an etiology of homosexuality on a psychoanalytic approach, that project has been taken up by more learned and competent hands as anyone looking at the history of the debate over including homosexuality in the diagnostic manual and at the credentials of the members of NARTH can testify. The psychoanalytic case is as adequate here as anywhere else.
Even if one dumps etiology for the more empirically attested research and therapy approaches, such as cognitive-behavioral therapy, we find that they are indifferent to genetic as well as psychodynamic causes and basically place the decision to be a homosexual well within the clients own choice so there is no practical import to being "born homosexual". Homosexuality remains a moral choice of identity, and may be questioned on moral grounds.
The question is begged on both moral and psychological areas, but the position is still presented as settled true. But such great questions remain aporetic and everyone necessarily has a right to their own opinion, not just in private but also in public.
Psychologically, convictions are efficiently formed as a basis for action in virtue of the individual's own set of intuitions and plausibility structure. Even the skeptic of any moral prescription except keeping one's contract has a set of assumptions that she is making a studied effort to conserve through argument and practical reasoning. But all do this with different plausibility structures. While some fail the test of time and change, strongly alternative accounts remain. As such, anyone of them may be rationally held such that no one ought to be socially condemned for holding them. Rather the hope for progress in views lies in preserving the right to express them, as our enlightened Founders concluded.
And contrary to the counter-bombast here from Cato, the position that marriage and family is an institution of natural intrinsic ends that can be characterized as proper functioning is one those views. The defense of marriage is about preserving marriage in that sense while allowing people who disagree to see marriage as a brute social contract to act accordingly.
But just as human rights do not imply a right to join any group you want, just as no one has a right to serve in the military or be a leader of a Moslem Student Group if you are Jewish, homosexuals do not have a right to enter into bonds of traditional marriage. They may form the kinds of institutions or contracts their own views oblige them to.
This kind of pluralism is founded on the presumption that there is greater resolution in the future, it gambles on the possibility of further enlightenment. This leaves all lines of communication open. But skepticism and relativism is necessarily committed in practice to work to support the claim that their is no ultimate truth whatever evidence may suggest otherwise. Thus, it constantly acts efficiently in the supposition that claims to intrinsic ends and such must need be self-preferential fictions and therefore bigotry. But the real bigotry is in the soft prejudice of moral skepticism as we can see here.
http://www.cato.org/blog/virginia-republican-candidates-not-joining-21st-century