I've read that the real reason why researches generated by war crimes are worthless, is because we can't replicate it. Using a result that its validity can't be

I've read that the real reason why researches generated by war crimes are worthless, is because we can't replicate it. Using a result that its validity can't be checked is just a way to disaster. And this is researches with the highest cost (human lives) and we still can't use it. Lots of "interesting" psychology experiments in the days of yore turns out to have lots of damaging confounding variables and we can't just redo the experiment because, well, we shouldn't.