It is absolutely true that Jews were incarcerated and sometimes 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. In fact, to save their skins, some weak or utterly exhausted men like Hoess eventually did cave in. Not one German functionary out of 26,000, however, reported knowing of such a genocidal program against the Jews.
All evil stems from it.
Torture might be a better word. 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, and there were other cruelties. Far from it.