- Law and order
Governments routinely give themselves exceptions to the laws they enforce upon others, and claim immunity from prosecution for wrongdoing.Futher, your assertion that this requires a monopoly is not evidence, much less proof. Meanwhile, private security, private arbitration, contract law, and tort law all either can or already do function in a decentralized framework
- Security from external threat
National governments create the very conflicts they claim to protect us from suffering. Meanwhile, the militia is a voluntary decentralized defense system which consist of volunteers from the populace.
- national security and sovereignty
This point presupposes the legitimacy and sobereignty of the nation-state, and is this begging the question. You are assuming your premise in your conclusion. This is completely meaningless.
- common minimum services
This is vague. What specific common minimum services require a monopoly state? The prior three do not withstand scrutiny. What else? Water, power, sewage, telephone services, groceries, etc. do not really require a government monopoly. And no, "what about my roads" doesn't, either.