>>That can be argued for pretty much any government activity. So by your logic lets abolish police, firefighters, the army. Why can't I choose my own police to protect me? That's a blatant violation of my contract liberty!!
I am not against government. The US had a government, with police, firefighters, an army and roads, in 1890, and no labor regulations that violated the freedom to contract, because during the Lochner era, the Supreme Court consistently struck down such laws as violating the Constitution's guarantee of substantive due process.
That you equate the provision of government services that are pure public goods, with restrictions that prevent people from exercising their contract freedom, shows you fundamentally don't understand the objection to these types of laws, or what "contract liberty" even means. I imagine you see "contract liberty" as synonymous with "anarchy".