Even in Auschwitz 75% of the prisoners were deemed not fit for work which is why they had so many things for them to do.
The camps not only hosted production lines, but also supplied factories with workers, and when the workers came back the health was gone. There was a big synthetic rubber plant near Auschwitz that was never bombed by the allies. Some say that the rubber story was just a cover up, it was an uranium enrichment plant and the uranium was later used for the Manhattan project.
Yes but they were not forcing unfit people to work.
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