"It was improper to not continue the control" No, it would have been improper and unethical to continue the control.
Once again, those people volunteered to participate in those trials. You will not be able to find in any outline regarding the proper, ethical conduct of clinical trials in which it would be proper to segregate into perpetuity the control group once that trial's purpose has been accomplished.
Fortunately, Dr. Mengele wasn't running that particular show.
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