Doing the right thing

I like testing out my morality / ethics against current issues (especially because one of the arguments for religion is that we get our morality from it - though someone like me would rephrase it as 'inspite of' instead of from).
So take the case of the Texas polygamist sect where supposedly children (especially female) are taught from their birth to obey without questioning, are told polygamy is right, and are told that their chief function in life is to breed. They are provided no alternatives, they are kept cut off from the rest of the world and indeed probably aren't aware that there are other ways to live one's life. When they are old enough they are married off, in some cases to an old @#%#$%$ with a handful of wives.
Claiming that some of the girls were underage when they were married and indeed pregnant , the Texas state has taken the children into custody. Their parents argue that they treat the children well, that they should be allowed to live their lives as per their beliefs and that the girls are given the choice and can reject any prospective partner.
It is however no choice at all as the children have been bought up to believe that they will go to hell for disobeying their parents, that there is nothing wrong in being the n'th wife of someone and breeding as much as you can. They aren't shown alternate views and they aren't allowed to see the world to find out for themselves. As every religion knows , the best way to get children to follow your footsteps is to teach it to them from a very young age where belief in the parents authority is absolute and the difficult questions are less. Once the religion becomes a habit , the child doesn't question it as is evident from the grown women of the sect vehemently defending their way of life even when the people most disadvantaged are themselves. Its similar to the Indian women being in the forefront of those against the girl child. Once you have been brainwashed , the beliefs come naturally and it is what you will practise on your own children
It is also probably true that separating the older children from their parents may have serious psychological repercussions on the children.
On the face of it this is a simple moral decision, the parents should be in jail and the children taken care. But this causes a problem, 'When is it OK for the state to interfere with how a parent brings up a child'. When a child is subjected to physical abuse? Certainly. Easy enough to prove and easy enough to convict. But psychological damage? Who knows? If we say in this case that the teachings are too extreme for children to be subjected to it where do we draw the line?
People like Richard Dawkin and Christopher Hitchens already believe that teaching a child about religion constitutes some sort of abuse . They are referring to stating that a child will burn in hell if he sin's but the view is still extreme enough and is not right other. Parents do have the right to teach their children their views. Is it then only question of how extreme the views are? Is the polygamist sect any different say from a Muslim parent teaching his child that if they leave Islam they should be put to death?
I think the problem is not in the views themselves but in the fact that the children are kept from discovering other ways of thinking. The parents are welcome to believe what they want and they can tell their children what they believe but they should not be able to prevent their children from seeing the world, seeing what else is there, from reading. The girls should be able to interact with other girls and women who can tell them that if polygamy is fine , why not polyandry? That women do achieve a lot in this world and their sole purpose in life is not breeding.
The exclusion of other views and other people is evident even in the not so extreme religions. Marriage is preferably within your own religion. Schools are created for followers of a religion only. Public places of prayer to hang out with 'like minded' people. Youth groups for .. you guessed it 'like minded' people.
The more I think of it , the more I'm convinced , our tendencies to hang out with people who believe the same things we do, or are from the same country as we are from, or speak the same language, or have the same skin color is one of the biggest ill's that our society faces and it this that we must prevent.
And we come down to what is the right thing to do in this case? Any child who has been made to marry at a young age , the husband and parent's should be put in jail. The parent's are free to teach their children anything , but they should not be able to raise them in seclusion. The children should have access to all the information that a normal child has and is appropriate for his age. Any parent preventing or actively hindering his child from doing so should be reprimanded / punished.