The question of open borders all boils down to the question whether you have a national self-identity or not, whether you have a special belonging or not, or if you have this higher identification...
UNHCR has published a Self-Study Module on Statelessness. There, it says:
Until late 2012, 21 years after the break-up of the Soviet Union, over 220,000 people in the Republic of Moldova were holding expired Soviet ID cards. Iulian Popov, Head of the Statelessness and Information Unit at the Ministry of Interior, can understand why Soviet IDs had such a long life: “If you have a Moldovan ID card, you identify with Moldova, but with a Soviet ID you can identify with a huge power.”
True. I can understand it too. What if we identify with the world? Isn't that a greater power still?