@GeeSussFreeK, @Psychologic, this experiment was tried. It was called "the United States" until about 1932.

Basically the answer was that voluntary donation for humanitarian purposes, and ecological purposes wasn't zero, but it was trivial compared to the money that goes towards those causes now, and the increased funding and universalized benefits made massive improvements in human welfare.

This is kinda the problem I have with even moderately libertarian arguments. The US wasn't a pure libertarian ideal at any point, but a lot of the big changes libertarians want were in place (no Social Security, Medicare, public schools, income tax, Federal reserve, labor laws, food safety laws, environmental laws, etc.) in the US for a long time, and the result wasn't pretty, even if you overlook stuff like slavery. Hell, you even had an extended period of lawlessness in the West, where "police brutality" was never an issue -- just holdups, kidnapping, rape, murder, etc. Lynchings in the public square were what made for justice back in those times.

Instead of giving rise to a perfect libertarian/anarchist/voluntaryist/whateverist society that had no need of government, it gave rise to the country that we live in now.