There is a difference between origins because origins you can trace back endlesly, and decisions. Versailles has the origing in the allied victory, these victory has the origin in the war, the war going long has the origin in for example the "Kriegszieldebatte" (and the similar debates in the other countrys), the war itself goes back to the dynamic of the political pwoers just before and after the killing of Archduke Franz ferdinand, these Dynamic is a product of early 20 century diplomatic, shaped by late 19 cnetury... an origin is never "one" its one brick an line of endless more before. But devisions happen at a time, from people, and as long we belive in responsibility of people at all, we have to belive in the repsonsibilty of people for decisions. Also: one unjustice, dosent give any grace to another unjustice. (Exactly that is what the idear of responsibility is: each decision is a new point of responsibility, not just a causal line of origin after origin)

Thats what the video said: every country has its dark past, its said at the end.