The irony of the case is that polygamy is illegal in Texas. That should be enough for prosecution.
Further irony: the women have custody of their children. In fact, they are now the legal heads of the “households” because the men wouldn’t stand and be held accountable for their actions.
If the women believed as you do, they'd courageously walk away from the ranch, one after another, with their children in tow. I'd bet they know where they can find help if they want it.
While I suspect many, but not all of them, are bitching among themselves about these "cowardly men", that inculcated fear of eternal damnation will keep them obedient.