open borders are not so bad when there is no pot of government goodies at the end of the journey. A well armed libertarian society would also dispose of its own trash quite quickly. A libertarian society would also be disinclined to meddle in the affairs of other societies.
Piling fantasy upon fantasy is not reality. That is why libertarianism has never been a reality in human history.
Hundreds of millions, thousands of millions of the globes third world people would prefer to live in the advanced, world of America without any consideration of welfare or benefits, only the chance to pursue their normal work lives in this country as opposed to the nightmares and lack of infrastructure that they face in their homelands.
If coming and going was unrestricted and completely up to them then they would flock here, take advantage of our libertarian abandonment to do whatever they wanted from selling burgers to running legal drug and prostitution rings and then they could stay or go back home and build villas.
I have to assume that at some point hundreds of millions of those people would qualify to vote. Do people get to vote in the libertarian fairy tale world?