What a bizarre world are we living in where you need a specially colored and printed piece of paper to travel and where it is this piece of paper, and not the technical problem of traveling thousands of miles, is the real challenge.
Now that every single person has rights, accepting them in your country also gives you a responsibility towards them.
My point was that identity controls predated travel controls and were a prerequisite for a "papers please" kind of society. Each state chooses (either directly or by will of its voters) what responsibilities it owes to non-citizens in its territory. Those responsibilities can range from almost nonexistent to very generous, but it is ultimately the choice of the state, and not the visitors to that state.