The Lessons of Versailles Almost a Century Ago

I saw that Margaret Macmillan has a lengthy piece in the New Statesman on the poor decision making of 1919.  What is even sadder to reflect on is the way that today's politicians don't seem to get the reason Versailles was such a failure.  The punishing of the German economy on a massive scale stalled economic growth throughout Europe and since trade is reciprocal and mutually beneficial it was to the disadvantage of the Germans and everyone else.  Exactly the same zero sum approach is being taken today to the Brexit negotiations.