Libertarianism is an attractive framework for initial thinking, but if you think anythign through, you wind up re-inventing something like the systems we have. What's left are the people who refuse to think it through because they are too attached to the "philosophy" that justifies them acting like an entitled ass in the name of "individual liberty". The result is comments like this.
Hell I can even come up with a workable UBI using libertarian philosophy that would at the same time solve the productivity / automation gap in wages people are seemingly concerned with using georgism as a base.
The reality is people that only have a basic understanding of libertarianism, often only looking to Anarcho style libertarinaism specifically, that make the statements you have.
Other forms of Libertarianism, like Geo-Libertarianism do exist.
EDIT: The jury is still out in my mind whether you add value based on how far out there you are.