The meaning of the final subtitles in the World War II movie Hell's Calm

It means "No proof of civilization is also proof of the crime of civilization to varying degrees."

The background of this sentence is the Second World War caused by racial discrimination and the pursuit of racial purity in Europe in the first half of the 20th century. This war resulted in countless human deaths and the loss of civilization. . Karl Barth's words remind people that the progress of civilization in history is often accompanied by violence and atrocities. Whether it is genocide in Europe or other forms of violence, it is a heavy burden on civilization and humanity.

"Hello" is a 2018 feature film directed by German director Lars Kraus. The movie tells the story of a true event that took place in East Germany in 1956.