Firstly, I'll admit that I have my own culturally-conditioned 'yuck' reaction to the thought of cousin marriage. However, I was initially against the idea of banning first cousin marriage because it's practised by such a huge chunk of the world. I couldn't believe it was actually banned in some US states and in some countries in East Asia.
Then I saw the effects of inbreeding. At least 55% of the UK Pakistani community are married to first-cousins and they've been doing this for many, many generations. Obviously, most of the kids are fine but there is a higher incidence of severe birth defects because of consanguinity. This is true in the Ultra Orthodox Jewish community, too. I think it's unethical to marry your cousin without genetic testing, especially if you come from a community where it's commonly practised.
I also think it ought to be discouraged with campaigns, for cultural reasons, as well as genetic reasons. The rate of first-cousin marriages is actually increasing amongst my generation of British Pakistanis, as compared to the last generation. I think this is because:
1. Since most cousin marriages are transnational, you bring another member of your family into the country.
2. It's a status thing (they have their own castes).
3. In my highly controversial opinion, there's a general cultural shift amongst the British Pakistani community to be more insular and less integrated, and marrying your cousin is part of that.
However, I don't want to pick on Pakistanis in particular; I'm sure most other countries that have communities with really high rates of cousin marriages have the same issues. In Israel, there have been cases of people suing doctors because they were born with inbreeding-related birth defects that they think the doctors should have detected, either with genetic testing before conception or through termination - i.e., they argue that it's better for them to have not been born.
There was a debate in the Netherlands regarding whether it ought to be banned. They decided that it would be impossible because such a ban would violate the ECHR and also discriminate against immigrants. The same would be true in Britain, so I don't think a ban is practical. I do think there should be a campaign, possibly led by health professionals within immigrant communities, to discourage it. Also, genetic testing should be widely encouraged, as it is in Israel, if people are going to do it anyway.
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Last edited by puddingmouse on 01 Nov 2011, 3:40 pm, edited 1 time in total.