I understand that you may not have very much experience with the history of the American libertarian movement. The fact of the matter is that American libertarianism became synonymous with anarchocapitalism and autarchy, as defined by thinkers like LeFevre, who along with Rothbard, Mises, Friedman, Kochs, and Welch created the modern movement.

Their networks were also deeply informed by Italian Fascism, which tended towards privatization and the replacement of the state with private capital interests.

Recommend you read the following books:

Gangsters of Capitalism
Democracy in Chains
Dark Money
The Contrarian
The Sovereign Individual

Then read this:

https://ia800901.us.archive.org/2/items/pdfy-qDYkCJZp968ltoLM/Meet%20Charles%20Koch%27s%20Brain.pdf

Then you can discuss this intelligently. But whatever the roots of libertarian thought, it has been fully co-opted by what most correctly be called propertarians or autarchists.