Because all humans, regardless of whether they are elect, are in the Noahic Covenant, things like civil laws and the role of governance in society are for everyone’s benefit. The goal of civil laws are not to make men right with God, but to keep the world progressing until every elect person is saved. God promised not to flood the earth again because he doesn’t want it destroyed until everyone who has been elected has been justified. Thus, civil laws and governance are temporarily concerned and can be crafted and initiated together with believers and unbelievers in the common kingdom. As Calvin said after noting the Judicial laws had been “taken away:”
“surely every nation is left free to make such laws as it foresees to be profitable for itself.”
Of course, Calvin made major mistakes in the area of jurisprudence, but his words are in the right direction, even if not all that close to a pure libertarian formulation. But the point is that because God’s people are not a single physical nationality, as was arranged under the Old Covenant framework, he no longer has a strict blueprint set of laws for post-Christ governments.
There are moral principles indeed (Calvin refers to the principle of love— and we libertarians define this more specifically to relate to non-aggression), which ought to guide the specifics of a code, but there is not single list of divine-granted codified stipulations for civil engagement as there was under the Old Covenant.
The divine purpose of civil law is to promote peace among men, to deal with the problem of conflict (per Hoppe), and to keep things moving forward until the full number of elect have been saved. And property owners ought to take this concept of civil law and craft the appropriate rules and regulations about the use of their property. Unfortunately, the State has swept in to monopolize and make artificial the entire purpose of the law.
While there can be diversity in positive laws, there is one moral code applicable to everyone. And we use this moral code to judge the wrongdoing of the state and it’s bastardization of the purpose of law: conflict avoidance in accordance with property ownership rules.