Why should nations be able to stop people? People are the greatest asset for a nation. Some nations don't let people leave, other nations want to pick and choose who can enter. Why?
taxes in those countries are paid by individuals, so in a way they own the nations & the nation is their property, just like their homes and other private property
yes, if they whole region/nation were private property each individual could decide who they want to let on their property. ideal. currently so much 'public land'