> During a visit to Minsk in August 1941, Himmler witnessed an Einsatzgruppen mass execution first-hand and concluded that shooting Jews was too stressful for his men. By November he made arrangements for any SS men suffering ill health from having participated in executions to be provided with rest and mental health care. He also decided a transition should be made to gassing the victims, especially the women and children, and ordered the recruitment of expendable native auxiliaries who could assist with the murders. Gas vans, which had been used previously to kill mental patients, began to see service by all four main Einsatzgruppen from 1942. However, the gas vans were not popular with the Einsatzkommandos, because removing the dead bodies from the van and burying them was a horrible ordeal. Prisoners or auxiliaries were often assigned to do this task so as to spare the SS men the trauma.
https://en.wikipedia.org/wiki/Einsatzgruppen#Transition_to_g...
Also, animals kept not in high concentrations have often been given antibiotics since the 50s. It’s not all about supporting concentration.
I understand that animals suffer in mass farming conditions—which is why I don’t buy mass produced meat or eggs or milk—but concentration camps are for people. You cans say animals are just like people, and I may even agree with you mostly, but to me and most people they’re not entirely like people. I understand if they are to you.