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I'm going to try to illustrate what I think are the root causes for the differences between the liberal and conservative take on homosexuality in general. I hope that this will be advantagous to understanding the difficulties that occur in the specific issue right now of gay marriage.
How acceptable a person finds arguments against gay marriage will depend at least somewhat on what he thinks the causes of homosexuality are. The stereotypical liberal point of view is that homosexuality, or more generally "sexual preference," is an intrinsic quality of a human being. The stereotypical conservative point of view is that homosexuality is a "choice." Clearly addressing the possible both of these understandings beg a further examination of what, exactly, we are talking about when we say "homosexuality."
As far as I can see, homosexuality can be defined in two interrelated ways. It can be defined psychologically as a sexual attraction to members of the same sex, perhaps along with the added condition of a lack of sexual attraction to members of the opposite sex. It can also be defined in terms of action--a homosexual can be seen as someone who engages in sexual relations exclusively with members of his or her own gender. While the "action" definition is a good way to empirically decide if someone is a homosexual, I think that the questions relevant to addressing the cause of homosexuality are best framed in terms of the "psychological" definition.
In particular, we are asking, what is the cause of this psychological state? Science commonly accepts two possible answers to such a question: genetics or experience; so this is a "nature vs nurture" question. As with most questions of this type, the answer inevitably becomes: "it seems to be both." That is, there is evidence that both environmental and intrinsic factors play a role in determining someone's sexual orientation. Studies of identical twins seperated at birth show a higher correlation between sexual orientation than a random selection (I don't have a source on this, but I'm almost certain that this has been established). The example of people in jail turning to homosexuality provides a very concrete, though admitted problematic, demonstration of how homosexuality is probably not entirely intrinsic.
Now, why does any of this matter? Well, it is, I believe, true that people have a tendency to believe that the less control people over a certain characteristic of themselves (and an associated behavior), the less justified we are in establishing any sort of moral or ethical code against that behavior. I personally find this reasoning heavily problematic, and I am not convinced that it is a valid, or even coherent, principle, but I find that most liberals and conservatives alike seem to work under this principle almost unconsciously.
The problem in the gay marriage debate is that this unconscious principle obscures what are really two seperate arguments either for or against gay marriage. The conservative tends to see homosexuality as both immoral and voluntary (when I say "voluntary", what I really mean is "not intrinsic"--to discuss whether or not this is seperate from "derived from experience" brings about all sorts of philosophical issues regarding free will, so I will neglect to attempt to resolve this subtlty here) while the liberal tends to see it as morally acceptable and intrinsic. Thus for the liberal, homosexuality is simply another characteristic of a person--much like his race, gender, or hair color. To the conservative, it is more like a bad psychological disorder--an acquired tendency to do something immoral, perhaps comparable to something like cleptomania.
Many of the arguments I see from the liberal side targeted at the conservative side focus only on critcizing the second conservative premise--that homosexuality is voluntary. The negation of this premise creates a heavily problematic situation for the conservative: he is forced with something that may be completely intrinsic and yet immoral. In particular, if he subscribes to the principle mentioned above regarding the relationship between moral judgments and nature vs nurture debates, it makes him look like a hypocrite. Likewise, if the liberal is forced to accept the premise that homosexuality is voluntary, he can no longer say that any law that targets homosexual behavior constitutes "discrimination" (though he can still argue against the value of the law itself, in reference to whether or not homosexuality is actually immoral).
This issue is thus very complicated because moral and epistemological stances become intertwined. When these subtlties are not consciously recognized, debates tend to go in circles, each side believing that the other is completely out of touch with reality.
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