How did this guy manage to separate the twins? Essential details lacking, story suspect.
I had the same question reading this article. Click on the name of the twins (see article) - the rest of the story is there. Like the author of this article, I do not trust science alone without a system (faith, ethics, etc.) to keep it in check. But, there were many more players in this story:
The adoption agency had a policy of separating twins, and the agency was "in on" the study. Even the adoptive parents were aware their adopted daughters were being studied, though they didn't know the true nature of the study. The birth mother has no interest in meeting the twins. They probably would've been raised separately, even if the scientist hadn't taken advantage of the opportunity to study them. I wouldn't put him in the same category as Mengele.