In the past I have read some libertarian literature that suggested the answer to the tragedy of the commons was that there should be no commons. Everything should be privately owned. How that would actually work in practice is way beyond my tiny brain.
It doesn't matter if it works in practice - it's religion, so it doesn't have to be true. We sent rockets up into space and there wasn't a giant man there watching us, but people still believe God exists. We tried living in a free market and everything turned to shit, but people still believe in libertarianism.
Former libertarian here. The issue with libertarianism is that it does not explain the state of the world. The world is inherently unregulated. If libertarianism was superior it would have outcompeted other systems and it would have been the dominant system right now.
Historic explanations are even more problematic. How does libertarianism explain nomadic cultures or rice growing cultures (that tend to be highly collectivist)?