In other words, you believe states should have the right to allow children to work in factories, with no worker protections. The total lack of moral sense in right-libertarianism never ceases to amaze me.
My point is, in the hypothetical situation that a state did allow child labor – which I do not at all condone – people could choose not to buy products from that state, as people already do in not buying products from certain brands and countries that use child labor.