If you presuppose that they're "interrogating the children until the story is straight," then what do you expect your conclusion will find? I am well aware of instances where the interrogators have abused their position and become more suggestive than interrogatory. I think there are some minimal safeguards against that possibility here.
I have no idea why you are sure that the state is out to get this bizarre cult of polygamous child molesters. (See how fun stating one's personal conclusion of fact is?)
I admit I’m suspicious of government, but I’m not an anarchist. I just don’t trust government. It’s not that government officials are evil. No, I don’t doubt most of them want to do the right thing and think they are doing good deeds. Nevertheless, bureaucrats wield a very terrible power, one that we citizens must carefully monitor and keep in check. Honestly, there is no form of tyranny that can’t be justified by the phrase, “I only want to help you.”
I don’t really think the government has an agenda here beyond getting the facts. Nevertheless, the power to round up hundreds of children and subject them to foster care and interrogations by social workers bothers me. The goal may be worthy, but the process irks me as being too authoritarian. I at least entertain the possibility some of these folks are innocent.