Originally Posted by
fairviewroad
But they are, strictly speaking, perfectly free to walk/hitchhike/bike to the border and leave, and no ID is required.
Is it perfect freedom of modes of travel w/r/t transborder crossing are restricted to walking, biking or driving -- and maybe gliding, ballooning, horseback riding? That sounds like equivocal and a highly qualified "freedom," not the perfect freedom of movement that you seem to be suggesting.