Which queue went to the Gas Chambers? And how do we know?

You would think there would be a proper scientific, forensic and police enquiry into the Holocaust just to iron out the many problems. Here is one.

On BBC 6PM NEWS (26 Jan 2025) Lydia Tischler (13/14 when she entered Auschwitz) saying she met Mengele who gestured Left and you lived and Right and you went to the gas chambers.

Here she is recalling her experiences of Auschwitz @1.05 in 2018 on Channel 4.

Well I very much doubt he was doing the grunt work at check in, he would have been selecting individual people for medical experiments not filtering those able for work. So that is suspicious.

But this Left/Right queue she refers to is one of the most famous tropes of all. Tischler says Right and you died. But Victor Frankl in "Man's Search for Meaning" p17 says he went to the Right and was told the people in the Left queue were going to a "special" camp.

I looked into this before and you get accounts from both queues. Did all queues live or did the Germans change them?

Now it is possible that the Germans changed queues, but then why did Frankl receive this certain information about which queue went to work at the start?

I have heard that this idea of a mass extermination had grown during the war (not unreasonable given the persecution) and haunted everyone so that in the queue before given any information people already had this idea. The sight of the smoke stacks of the crematoria burning the hundreds of bodies that died from disease, exhaustion and, as the war went on, starvation would have been a very ominous sight. And it is hard to think that the NAZIs would have kept babies and the old alive especially as they ploughed ever more resources into defending themselves from the Allies. We would need to look at the USA and what it did with babies born to slaves and slaves that were no longer able to work for some idea what NAZI attitudes would have been. I'm sure plantation owners focused on profit would have spent much time on slaves in America.