See, unlike homosexuality, social science and psychology still say a lot of bad things about incest.
Oh, we can get over THAT. The same way "science and psychology" had "advanced" to the point where homosexuality is considered to not be abnormal.
Let's use the same methods, shall we?
1). We shall start by showing that in nature, contrary to the "far-ranging prejudice" in our "racist society", incest is actually quite common. (It is, in fact.)
Repeatedly assure those who doubt your motives that you just want "scientific truth", and absolutely will NOT ever demand incestual marriage.
2). We will continue by showing that the idea that incestual couples lead to more birth defects is an urban legend. This doesn't have to actually be TRUE, you know: just embrace the studies that claim incest causes no damage, and shout down sudies that claim the opposite as "reactionary", "biased", etc., something no right-thinking person would accept.
Continue to assure those who doubt your motives that you only want the "scientific truth", and will absolutely will NOT demand incestual marriage.
3). Moving on to psychology, we then claim -- as it was done with homoseuxality -- that the ONLY reason incestual couples are often pathological and unhappy is society's unjust, evil rejection of their alternative way of life. Again, as with homosexuality, this dogma need not have the slightest connextion to the truth.
It DOES, however, have the "advantage" that the only way to disprove it is to first remove all legal, ethical, or social barriers to incest, and THEN see if indeed incest is perfectly normal in a "non-discriminating" society.
Continue to assure opponents... etc.
4). Using (3)'s dishonest conclusion, we start a media blitz with sad, sad stories about incestual couples "facing discrimination" -- that is, shunned or disliked -- by primitive (preferably Christian) neighbors; happy, happy stories of the "contrary to what society thinks, I'm living with my mother for the last 25 years and it never did either of us any harm"; as well as the usual "all families are equal" nonsense.
We shall use the word "incestophobic" a lot in this media blitz, too. We shall apply it, as is done with "homophobic", to any and all opponents of incestual marriage.
Contrary to all your previous claims, now demand incestual marriage.
5). After a few years of (4), social acceptance of incestual marriage in the "progressive" part of society will be a
fait accompli, while social opposition to it will be seen as more and more eccentric, primitive, even evil and "incestophobic".
Incestual marriage, here we come!
Yes, this process might seem to you absurd, terribly unfair to opponents of incestual marriage, and little more than social brainwashing that's planned in advance to end in the desired conclusion, despite lies to the contrary in the early stage.
But this is -- more or less -- the way "homosexual marriage" became inceasingly acceptable, too.
So I ask again, as one "homophobe" (opponent of gay marriage) to another "incestophobe" (opponent of incestual marriage): Why the whole rigamarole? Let's just accept incest as marriage and get it over with.