Not that the only group of people who want to bother nobody else need any justification for living their lives as they see fit, but how else is humanity going to learn about the different ways we can organize society if we don't try them out?
It would be phenomenal for humanity if people with ideas outside of the box organized as they saw fit without outside interference and we all get to see what works and what doesn't.
Historically this is not the reason. And as a justification for continuing to have many countries it would only be convincing if people were free to choose which "experiment" to join or start.
The reality is, we are all guinea pigs that get thrown into some random country where some experiment has already started and we have no right opt out. If this is indeed someone's experiment, I would say it's highly unethical :)
Existing countries are captured by various interest groups who use their control over the government to their benefit. In a democracy this is generally various industries or government factions that control a large voting bloc or resources politicians need like campaign contributions. In a non-democracy the existing rulers want to remain in power and continue to rule as they see fit.
If the experiment you want to run is a country with an extremely limited government, you would either need a stable country where that is already the case (not currently available), or a way to overcome the entrenched interests in some existing country (good luck), or you need a new country not already beleaguered by entrenched interests.
It is land that Croatia very actively considers someone elses land. That is why Liberland was established there in the first place. Two countries are arguing "not mine, its yours" about a plot of land.
If anything, this can be used against Croatia to argue that it is in fact Croatian territory
It doesn't consider the land to be "someone elses land" it considers the Serbian definition of the shared border faulty. Letting people that cite the Serbian definition of the border settle there is the last thing they want, since it actively undermines their own definition of where the border between it and Serbia should be over its entire length.
Edit: I suppose that actually allowing an independent state to settle there would ruin their chances of ever trading it with Serbia for the eastern land, but the chances of that are slim to none anyway.
> their border claims then they should see Liberland as strictly Serbia's problem.
They don't want it to just be "Serbia's problem" they want a signed document by Serbia accepting Croatias definition of the entire border stretch.
Also just because both sides do not want to claim the territory does not mean you can leave it entirely lawless. Hell there is a small but popular lake near my home town that the three towns bordering it disclaim any ownership of, which doesn't get rid of the issues surrounding the lake, like the fact that they have to pay for road maintenance and everything else related to it, it just makes it a mess to sort everything out. Police would also drag of any group of crazy people trying to create their own floating country in the middle of the lake.
You only get into full terra nullius when no country will claim the land. Since there is no higher umbrella authority, any police force operating in terra nullius is operating outside its self-professed jurisdiction.
After looking up the definition of terra nullius it seems to be a term historically rooted in colonialism where states could only establish themselves by successfully applying massive amounts of "sovereignty" aka military power against colonial powers.
Given that Liberland seems to be unable to showcase its sovereignty against Croatian invaders it fails the basic test for acquiring land or even official statehood required by terra nullius.
> Since there is no higher umbrella authority, any police force operating in terra nullius is operating outside its self-professed jurisdiction.
And who is going to complain about that? Certainly not an established state.
The Darien gap, China & Myanmar border region, central Africa -- these are "lawless" areas despite having clear territorial ownership.
After all, look what happened with Kugelmugel - another of these liberal experiments:
https://theculturetrip.com/europe/austria/articles/kugelmuge...
Spoiler: the bigger states always win.
However, this was a product of the Boomer generation, when they were young. It might not be possible in today's more authoritarian world.