The last time a German broke so many English hearts, it was the Second World War. At that time, the two nations were locked in a civilisational and ideological battle. But the arrows of time are swift, and history is quick to reconcile nations, people and ideas. This is why people across Liverpool, across England, and across the world, in fact, are mourning the departure of Jurgen Klopp — the charismatic German manager of Liverpool Football Club.