It is absolutely true that Jews were incarcerated and often treated cruelly. The Allies, independently and singly, interrogated 26,000 functionaries of the National Socialist regime immediately after Germany's defeat, all based on the same set of questions. Some people might have thought of lying for their own benefit by implicating others. Not one German official reported knowing of such a program. They all said that the first time they heard about it was from the Allies after the war.
All evil stems from it.
Here is the background story. Documents, testimony and confessions as well as affidavits presented at Nuremberg and elsewhere were frequently produced and signed after psychological and physical torture of its authors. He was kept naked in an unheated cell and was made to drink from the latrine. Guards forced his teeth open with a stick so as to spit in his mouth. Yet another source is the Simpson van Rhoden Commission of Enquiry into the conduct of US interrogators during the Malmedy-Dachau trials.