No, tax incentives are a totally different issue on not on the subject. You have, however, proven my point.
Regardless, hope there are at least some of these women & children who can manage to find their own lives. For the younger ones, there's perhaps hope of schools & attempts at an "outside" life. For the older women, I am concerned that's all they know. Then again, that's not all that different from older women who find themselves divorced and on their own to support themselves with no job skills, except at least they would probably be used to a typical life.
We don't have the polygamist sects down here (although apparently there are some snake handler churches, eek!), but we do have some branch of the Church of God, which, you can always tell female members because the girls/women wear their hair long, longish skirts only, no make-up.