Borders are a necessary reality in light of the Second Law of Thermodynamics.
They allow an organism to take in the good, retain the good, keep out the bad, and expel the bad. Nor organism can survive without them. Since humans are organisms, surely borders are necessary for the survival of human organizations, such as countries.
That being the case, things which seek to eliminate borders are per se destructive of the thing contained within the border.
This thesis is explored in Border Stories, which I highly recommend.