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?
why should you be able to stop me and my 50 goons from invading your home & moving in?
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'