Comment by kevingadd

Experiments producing lots of data doesn't necessarily mean they were useful. If the experiment was run improperly the data is untrustworthy, and if the experiment was designed to achieve things that aren't useful they may not have controlled for the right variables.

And ultimately, we know what their priorities were and what kind of worldview they were operating under, so the odds are bad that any given experiment they ran would have been rigorous enough to produce results that could be reproduced in other studies and applied elsewhere. I'm not personally aware of any major breakthroughs that would have been impossible without the "aid" of eugenicist war criminals, though it's possible there's some major example I'm missing.

We certainly did bring over lots of German scientists to work on nukes and rockets, so your question is not entirely off-base - but I suspect almost everyone involved in those choices would argue that rocketry research isn't unethical.