The excess risk of defects etc is about 2%. That's a lot! That is many thousands of kids that are suffering unnecessarily. If the governments in cousin marriage

The excess risk of defects etc is about 2%. That's a lot! That is many thousands of kids that are suffering unnecessarily. If the governments in cousin marriage permissive countries actually had to pay the cost of looking after these disabled people, cousin marriage would be out the door very quickly. There was also a study looking at the genomes of a large consanguineous pedigree. The amount of pathogenic genome changes seen was shocking, amazing that the phenotypes were normal or mild... that is a gift you will pass on to all your descendants.