Freedom of movement has more or less always been there in Europe Goldie. The only real borders were those thrown up by the Warsaw Pact, and they were what you would call super hard borders. Elsewhere the so called green borders have always been negotiable simply by avoiding roads. Germany has 9 land borders and could not control all of them with or without Schengen - the Schengem agreement was simply a recognition of something which has always existed. I have been in some out of the way places where I did not know which country I was in (in the Pyrenees between France and Spain for example) Europe's borders have always been porous.Yes, I can see that for Germans they are surrounded by beautiful, historically interesting countries that are easily accessible without flight, boat or tunnel. In some ways, you have just made the case for Brexit on freedom of movement. We have to take one of those three and show a passport, so why not fly to a resort in Egypt? The Brits have no particular reason to love freedom of movement so it's no real loss to most of them, and control over entrants is seen to be a gain
