So you would forbid them from having children then?
Maybe you can have the State forcibly sterilize them or something. If that fails you can contact the Chinese government and get some tips on how to run a snappy program of forced abortion.
I bet these people “gasp” homeschool, too! Let’s just send in the State and take their kids at gunpoint so they can be properly educated in a State approved setting.
What I would say is this:
If you are interested in a polygamist lifestyle, you should be of the adult age that we don’t have to worry about children. That should be a grown up decision anyway. Make sure the lifestyle includes you and not kids who have no choice, eh?
I note you haven’t answered me yet. What do you intend to do about junior high school aged girls being promised to 85 year old men, and junior high school aged boys being dumped off in the desert, with only the clothes on their back.