How many millions of Jews were in these camps at any particular time? How many had passed through the Reinhard camps or other transit camps just like them? What happened to the Jews as the Soviets advanced westward eventually? How many Jews were the Germans able to take west with them? What happened to the Jews that came under Soviet control? How many Jews were killed by Soviet forces for having been pro-German collaborators? Why were the Auschwitz Jews so terrified of the Soviets that they actually "chose" in huge numbers to go west with the retreating SS, supposedly the greatest, mass murderers of Jews, rather than be "liberated" by Soviet forces. Elie Wiesel and his father both "chose" to go with the SS.
"The gassing takes place as follows. The unfortunate victims are brought into the hall where they are told to undress. To complete the fiction that they are going to bathe, each person received a towel and a small piece of soap issued by two men clad in white coats. Then they are crowded into the gas chamber."
— The Vrba-Wetzlar Report on the homicidal gassing at Auschwitz II (Birkenau), April 1944