@Alsacienne – it wasn’t ill advised when I posted – the French borders were temporarily closed and at least one flight from US cancelled as a result.
We can all be wise after the event. As some EU leaders will find as they scramble chaotically to reintroduce border controls. In the UK we are all used to “inconvenience” at borders, at least it provides a degree of control, we learnt our lessons many years ago from episodes like 7/7.
Thank heavens we never participated in the great Shenghen experiment.