Now that two of the men arrested in Texas are charged with marrying underage girls who were also relatives, the question rises again: Why do polygamists figure they are exempt from the ancient and scientifically-sustained taboo against marrying and bearing children with members of one's own family? The answer has to do with the same entitlement that accompanies polygamy in general: a belief in eugenic breeding. In these circumstances, eugenic breeding is rooted in the idea that people who are "called to live the Principle of Plural Marriage" are somehow superior to other members of the human race: more intelligent, better looking, physically superior, etc. If the idea seems familiar, look to Germany during the Holocaust. Eugenic breeding was used to justify the murder of millions among of mental patients, political activists, retarded people, and various ethnic groups, including gypsies and Jews so that the "Aryan race" could retain its "purity."
As for me, I think people who go to such lengths to justify their "superiority" are covering deep-seated fears of inferiority. What do you think?