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.
But by virtue of our baptism, Peter Akinola and I are brothers in Christ and one day we are going to be in heaven together, so we might as well learn to get along here because we will have to get along there. God won't have it any other way.
It's not about me. It's about not having to be ashamed.