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The government's duty, in this regard, is to place its support behind what is in the best interest of the nation. Marriage endorsement is about families and providing family support, so the question comes down to if these other marriages are in the best interest of families or not.
I have not seen much evidence that polygamist marriages are better than marriages between two individuals, in terms of raising children. Incest would never work because it causes harmful genetic illnesses.
The problem comes in how we are defining families, in terms of what the government's protection interests. If it is only about children, then those who cannot have children should not be getting married. But we have long since established that a couple alone are a family. So while there may be a legitimate reason to ban consanguineous couples from producing offspring, that does automatically equate to a reason to prohibit a legal marriage. Do note that many incest laws do not cover only consanguinity. Most would prevent sex and/or marriage between couples related only by law.