Most of that stuff was just torture for the sake of cruelty. It lacked the scientific rigor needed to classify it as even remotely close to research, so most of the "data" collected is completely worthless.

Turns out you can't do proper experiments when the subjects are also being starved and worked to death, when you lack a proper control group, or when you interpret all the results from a heavily racist perspective. And that doesn't even touch the completely nonsensical hypotheses yet.