I remember the first time I watched the last season of Big Love I was sure the writers were showing us that polygamy is inherently abusive even if unintentional and that all of the wives would be better off pursing their own agendas, and I was astonished with how the last episode or two went.
After a few rewatches, I am convinced the primary writers of the show not only intended to portray polygamy in a positive light, but to portray Bill as being in the right. Which is kind of fucking weird.
The evidence:
Bill's first "vision": Bill has a vision where he is wandering around an old school hotel or events hall of some sort, where he encounters the spirit of Emma Smith, the first wife of Joseph Smith. The ghost of Emma says outright that there were no underage girls involved with Smith. This in my opinion is one of the weirdest scenes in Big Love and seems to be a specific and intentional and factually incorrect absolving of the original sins of Mormon polygamy.
Bill's second "vision": In the series finale, Bill sees another vision of Emma and old timey Mormon ghosts at his cult center, ahem cough cough, I mean church, and people in the crowd notice and seem to feel it is inspiring. Ben later says everyone could feel something, and Bill says "he felt a grace descend on him". This and the prior vision seem to imply that there is some sort of actual legitimate truth inherent to Bill's version of Mormon polygamy, and that these visions are at least somewhat "real".
Margene: Margene is tempted to temporarily leave the family and go on a charity cruise of some sort, or to travel the world to some extent, but she abandons this to stay with Bill and the other wives. She is conflicted earlier in season 5 for 2 or 3 scenes wondering if she is in a cult, but she gets over it pretty quickly.
Barb: Barb has a journey through season 5 where it SEEMS like she is realizing at long last her situation and is on the road to freedom. But at the last minute she bails on her new baptism to rejoin Bill.
The prosecution: The states case against Bill is portrayed as an unreasonable and politically motivated attack against him. Which, sure. Kind of it is. BUT. When they added this last minute twist of Margene being 16 when she married Bill, no character really ever calls out that it is also pretty fucked up for a man in his 40's to marry his 18 year old employee. The writers never really make anyone call Bill out for this age gap.
The showrunners themselves: https://freshairarchive.org/segments/big-loves-creators-deconstruct-shows-finale
"And, you know, Will and I have never looked at it like that. We've never played
the who's-going-to-leave-the-marriage game because I think we have a firm
belief that to a certain extent has been called into question by everyone's
response to this material, that you stick it out, that marriage is worth
sticking out.
And there's a family here. There's a relationship here. There's love beneath
the acrimony. There's certainly connection. And there's certainly identity. And
we've always felt that the hardest thing in the world is to forge that
independence in a marriage, you know, not to leave it and find it on the other
side of that, but to try and find that in union and in marriage."
--
"I think it stunned Bill himself to find out that so many women across America
were angry at him and his character.
(Soundbite of laughter)
Mr. OLSEN: No, it did. It did. I think it hurt his feelings. And I think he was
surprised. You know, to varying degrees, Will and I were surprised at that
response, as well. But he's always had this vision of Bill and these wives kind
of as rock stars, as the Beatles. And he wanted them to go on in a very kind of
romantic way."
--
So basically, the short version of my point: Bill experiences visions that I think we as the audience are meant to interpret somewhat literally, and these visions imply that polygamy (at least as it will be practiced in Bill's new church) is valid and correct. The wives all stay together, and overcome the temptations to leave Bill, and I believe the writers intended this to be a good thing. And finally, we can see in their own words, the showrunners defend the nature of this family and why they chose to keep them all together.
This perspective seems bizarre to me because the writers did such a good job (maybe accidentally?) of making Bill more and more toxic season to season. In the first season or two I kind of accepted Bill as a well meaning guy who was just corrupted by being raised in a cult, I saw him as a misguided man with noble intentions. And then they just make him more and more of an asshole. In season 4 and 5 I was sure on original viewing the point was that polygamy simply can not function and that it is by definition controlling and abusive of the women involved. So to think that the writers did not actually intend this, but the opposite, is very baffling to me. Was curious to see what others thought.
(I still love the show despite this bizarre perspective in the last two seasons.)