Examples of Libertarianish Countries
A political philosophy is only as good as the outcomes in a country which models it. “It hasn’t really been tried.” or “It would work if the people implementing it believed in it more” are weak excuses. If you can’t find a country run by people who more-or-less follow your approach that isn’t a total hellhole, your political philosophy is nonsense. If you are a radical, countries closer to your ideal should be noticeably more pleasant places to live than countries further away from your ideal.
Here is a list of democracies (determined by a 1 or 2 ranking from Freedom House over the last 10 years), whose Heritage Freedom Index is at least 50. That is sufficient for me to deem them free enough that I would consider their political systems to be acceptably close to the libertarian ideal of freedom and democracy.
Notably absent from this list is Singapore, which is not a democracy. Although it is only partly free politically, individual polices do not impose on its citizen’s freedoms nearly as much as other dictatorships. It is an exception which proves the rule that personal freedom improves aggregate outcomes.
Libertarianism’s critics cannot accurately say that it has never been attempted. Countries which are closer to the libertarian ideals are significantly better places to live than countries which are further away.