Most have heard: “There are two sides to every story and then there is the truth.”
Also, most have heard, “History is written by the Victors.”
Most have not heard the German side of the causes of World War 2.
In the US, as in essentially all countries and in all times, the citizens are presented with one version of critical events; the version that the people that control the State want the people to hear.
This documentary presents a version of the events leading to WW2, the causes of that war, from the German Perspective.
This version is the one that the US & Western Powers That Be did not want the citizens of those lands to hear.
Is this version the full truth? Likely not. However, the best way to determine the full truth of a matter is to allow all the interested parties to tell their story, their side.