But once property rights are disrespected – no matter the theoretical soundness of the professor’s idea – will the masses listen to libertarian reason about where to draw the line?
If I have a right to control the borders to my property, I along with my neighbors have the right to delegate this to an agent, acting on our behalf. This is as perfectly libertarian as it gets.
The only issue is that today’s provider is the monopoly state; I have only one way to put my sound libertarian right into practice. Only one. It is also true that those libertarians who wish to allow any and every biped from all corners of planet earth onto their property also have only one way to put their desire into practice. Only one.
Libertarian theory supports both. Libertarian theory offers no answer.
Of course, we have no way of knowing how many people would choose this service given that the agent today is the monopoly-state. We do know that where property owners have freedom to discriminate, they do so.