Alright. I'll buy up all the land surrounding where you live and deny you access to the world. It'll be purely a voluntary transaction between me, your neighbors, and the city. You weren't consulted but based on your moral belief structure you believe that is acceptable so you shouldn't complain when I wall you in and don't let you leave.

No? You don't like that? Well, it was a purely voluntary transaction on par with what you suggested.

Natural monopolies exist in the real world. Pretend they don't at your peril.