Re: Not really a huge stretch, Tom . . .
Nazis collected data because they were killing animals who were nearly people anyway. The research conducted on the dying could possibly benefit real humans (i.e., the Master Race).
It's a mind-set sort of thing.
Today, artificial insemination requires that the technicians fertilize a number of eggs, resulting in several working samples to choose from. Those not used were not yet considered human, so could be used for fetal stem cell research. Today, these samples are considered human -- and so are simply destroyed.
I think that covers it,
Dan