You can provide a hundred more, you'd still be wrong. I only read the first link of yours to see what you really meant that came out all wrong. QUOTE]
Question is close relation marriage is good or bad? Do not take few words from my post, take the meaning. From the first link I provided giving some quotes. Also read the third link, it may open your mind.
A cautionary note
In societies with a tradition of first cousin marriage, many
couples are often more closely related than first cousins are and
consequently their risk may be significantly higher.
Now I am bore to explain you that close relation marriage and tradition of marrying in small group is not good.
Munda, that is not proof close marriages are bad. Like most things, it depends. If the genes of both close relations are good, then a close relation marriage will produce genetically good offspring. In this case, if someone wants to maintain the quality of their gene pool (and some people do), then it is an idea to think about marrying within. However, it seems to be a lot of people do it for other reasons now, which have nothing to do with genes, more cultural.
But for sure, two close relations can produce genetically better children than two distant relations. It all depends on the quality of the genes in the parents, i thnk you can see.