Michael Huemer holds that no government is legit. But also he is for capitalism. So for security he would have private firms.
It kind of reminds me of when the Roman Empire fell and who ever could get enough people to back him up made a castle in which people could have protection from the roving bands of robbers that filled the vacuum. And for the security that the lord of the castle provided people worked for him as serfs. I.e the feudal system.
Now I am not being critical of that. After all the feudal system is one stage that led to the Renaissance.
But the critique that applies is the contained in the Federalist papers. There there is a not a lot of history but they are assuming their readers are familiar with the history of places that bounced back and forth between tyranny and anarchy from the fall of Rome until their days. So they were not happy with the idea of anarchy, or even a weak government.
One point in the Federalist papers was that those who profess to speak for the right of the people always bring about tyranny. Even more recently we have seen plenty of examples--the USSR, Nazi Germany are just two more famous examples of demigods who got power by their constant claim of upholding the right of the people [i.e. Ethnic Germans of the "working class"] against the government.
One thing that might make the American Constitution better than schemes of philosophers is that teh founding fathers were learning from history more than philosophy. The thing is nowadays no one really knows the history that they were learning from except experts in those areas. The warring Italian states ( in Greece) provided plenty of material for the founding fathers of the USA to learn from mistakes of "all power to the people" that goes directly to tyranny; and then that is thrown off again to all power to the people etc.