Who knows where this legalizing same sex marriage will lead to next in the U.S. Maybe legalizing polygamy? Incest? We have a moral obligation to stand up for morality and vote against laws which stand for immorality and against the common good. Civilized rings a bell.
This is a slippery-slope argument. At least you didn’t mention bestiality, as others (including earlier in this thread) have done. But the fear that one type of legislation will lead to another is, in itself, not a reason to vote against marriage rights for same-sex couples. It is a specious argument. Either the laws prohibiting same-sex marriage are, like the laws prohibiting interracial marriage were, a violation of the Constitutional right to “life, liberty and the pursuit of happiness,” in which case, they ought to be struck down for the sake of social justice, regardless of any other doors this might potentially open; or the laws prohibiting same-sex marriage are just, in which case they ought to be upheld, again, regardless of any other types of legislation that might follow.
And if you accept the premise that the laws prohibiting same-sex marriage are just and fair, then you need to justify this based on secular law and secular society - not just Church teachings. Why? Because as others have pointed out, the laws affect people beyond the scope of the Catholic Church’s authority. It is unfortunate that the same term, “marriage,” is used to refer not only to the religious sacrament, but also to the secular legal contract. But that is the reality of it. And while the Church certainly does have the right and authority to regulate sacramental marriage, that authority should not extend to regulating the secular legal contracts of others. As someone mentioned earlier in this thread, “render unto Caesar what is Caesar’s” would apply.
Someone else brought up the concept of Civil Unions. If that truly were the equivalent of a secular marriage’s legal contract, then it would be a valid argument - and, at that point, it would make the most sense for all secular marriage legal contracts to be deemed civil unions, thereby reserving the title of marriage for a sacrament recognized by a religious institution. However, civil unions are not only not equivalent with each other - the term, along with domestic partnership registry, can refer to many different sets of rights and regulations in different states and cities - they are not uniformly recognized, and are not governed by the interstate trade laws in the way that legal marriage is. The disparity goes far beyond the few examples given earlier in this thread, such as the right to sponsor a non-citizen spouse for citizenship. In fact, a 1997 report generated a list of 1,049 rights that are automatic with marriage, but not with civil unions. Among these were portability (recognition in other states and municipalities, and even other countries), federal rights (including sponsoring a spouse for citizenship, but also things which apply to more people, such as a spouse’s social security or pension benefits) and next-of-kin rights. Also, by having two different terms for the same legal contract, even if the two (marriages and civil unions) were to be made equivalent at one point in time, the moment any new legislation affecting marriage was put into the law, the two would no longer be equivalent, thus creating a nightmare of both retroactive and future legal entanglement in defining the two.
So, clearly, from both a practical and an economic viewpoint, civil unions as an alternative to same-sex marriage, is neither viable nor sustainable. And denying civil marriage rights to same-sex couples simply because the word
marriage is also used to describe a religious sacrament, boils down to a game of semantics. To put it simply, there is no real way to justify supporting civil unions as an alternative to civil marriage for same-sex couples. It just becomes a costly and time-consuming euphemism. And, frankly, it won’t stop couples from using the term marriage to describe their legal relationship to one another, nor will it stop them from seeking sacramental marriage in a church that does allow same-sex marriage (such as the MCC). So at that point, the only real choices are to allow same-sex couples the same equal civil marriage rights, or not. But doing so will have absolutely no effect on sacramental marriage.