For a flavor the carefully chosen arguments, read the whole work. An abbreviated argument for the latter group includes.
First, polygamy creates an even more "favorable setting for procreation."Where’s Joseph Smith when he’s needed?
Second, polygamy empowers wives who want to stay home with the children, equally empowering other wives who want to work. It motivates men to profound maturity and responsibility. Children can be raised at home by family members who love them - rather than being raised by low-paid strangers at daycare. Unquestionably, that creates an "optimal setting for child rearing."
Third, polygamy can free abandoned single moms from the "work-just-to-pay-for-day-care" cycle, empowering them to leave or avoid the welfare trap. That helps to preserve "scarce State and private financial resources."