Go to Yad Vishem and visit the Records Room Faddah. The NAZIS kept meticulous records. They thought they were going to get away with it.
I’m not the one who needs to study this issue. I know that no sane person who has ever studied it (and there are many thousands) has concluded that there is even a remote possibility that the Nazis were not using gas chambers to purposefully exterminate Jewish prisoners, and that’s enough for me. Anyone who advances a claim that “disinfection” might have been the purpose of the gas chambers is either rabidly anti-Jewish or dangerously mentally ill, or both. And I’m beginning to think the Pope is mentally ill, because I can’t fathom any other reason for his decision to lend credibility to this wacko SSPX outfit.