As a temporary governing power of their children, parents have almost absolute authority over their kids. We all know that those in power can let the power go to their head or abuse it, and that there are some extreme cases where parents abuse their children, often when carrying out punishment for broken rules.
Should there be any sort of balance of power to help in the less extreme cases? Parents will more times than not say "no" because they are in that position of power, and you are proposing to take away from that power. However, there is some backing reason to this response; with limited power, they might not be able to teach their child properly.