ddt
Mafia Penguin
You can trust Germans to have the expertise to build impenetrable border walls though. Or maybe a wall is overkill and just build an electric fence.To instate (or re-instate) border checks, first I think you need to demonstrate that they'd be effective. In the case of borders in Benelux or between France and Benelux, France and Germany and so on there are so many crossings that, unless you build a wall all the way along the border, the "bad guys" will still slip through whilst law abiding travelers will be inconvenienced. even with a wall there's no guarantee of effectiveness.
And on a serious note, to reinstate border checks would be very unpopular. Border checks between Netherlands and Belgium were abolished before I was born, and border checks with Germany a memory from my 20s, and mostly a memory for their hilariousness. Like that time the officer looked at my pouch of tobacco and asked if it's only tobacco. Yes sir, only tobacco. Really? Yes, really. Really? Yes, really really. OK, drive on.