The state's interest in marriage is stability. Generally speaking polygamy does not work for stability. Inherent in the whole polygamous movement is a deep and abiding misogyny and denigration of women. So polygamy is objectionable on lots of grounds.
The biggest kick I get is to communicate with those who are exiled from the game - in hospitals homes prisons - those who have seldom seen a game who can't travel to a game those who are blind.