This is the argument the East German Communists used to prevent their people from crossing the Berlin Wall. They said the rest of the people had joint property rights in the education of the East German people who wanted to leave and they were therefore too valuable to let go to the West.
Not sure the Vopos cared all that much about school anyway.
However, an argument from the "social contract" implicit in any nation-state is certainly far different than your analysis of the GDR position.
Besides, once I got a couple of other supposed Freepers to argue that there was no "social contract" and they owed nothing to no one at any time on any account, I knew I had surfaced some more of the Libertarian/Libertine crowd who have no place else to post outside of Bartcop.