True Communism was never intended. The greatest problem with these two experiments is that their designs were ill-conceived. The Manhattan Project's goal was to develop a weapon capable of massive destruction and death. The goals of these experiments were malicious. This made the results predictable, if not pleasant.
Psychology is a tame social science, there's no question about it.
But as I've said in another post, there is no such thing as over-cautiousness when testing human subjects.