The question we should be asking is how much that we value for other good reasons we are willing to give up in exchange for the possibility of improving the protection of our children, when there is no crystal ball that tells us either how much of an improvement any given measure would actually make or how much of the potential harm from giving something else up would actually be realised.
Until we view these kinds of rights and protections issues as a balancing act with legitimate arguments on both sides but also genuine concerns from both sides it's impossible to even have an intelligent debate on the ethics, never mind write good laws with all the extra practical concerns that legislation and enforcement introduce.