The Nazis also believed many sane things, like exercise and the value of nature and animal welfare and the harmful nature of smoking.

one question I pondered at times is if the experiments done on prisoner by Mengele and others actually lead to anything interesting. In theory the lack of ethics would allow for more research with less effort. But it seems they did not, and actually worked rather sloppy. I guess that is preferably, because otherwise the ethics people would have a hard time keeping eager researchers in check.