I'm sorry, I came in on this late.... Claus, are you sure you want to say this? I've spent too many hours preparing reports for various "Human Subjects Committee" and similar stuff to let this pass by. A very important part of the scientific process as it is currently practiced involves a number of important ethical aspects -- for example, informed consent, risk management, non-coersion, et cetera.
More generally, there are a number of widely acknowledged ethical norms that are central to scientific inquiry. Don't falsify data, don't cherry-pick from the experimental findings, publish your results, acknowledge sources, et cetera. You can find massive tomes detailing the rise and fall of the psychologist Cyril Burt for exactly this sort of ethical violation; it's now almost to the point that no reputable journal will permit you to cite him, because his data cannot be trusted. He has been excommunicated from the practitioners of "science," and We Do Not Speak His Name.
By modern ethical standards (and part of the reason those standards exist and often have the force of law), the Tuskegee study should never have happened. This has nothing to do with the findings or lack thereof. It's a simple statement of what Scientists Don't Do. So there was an obvious process failure at some point, where someone said "let's do this!" and someone else, who should have said "Hell, no!" didn't.
And I see no reason to assume that the second person, the one who failed at his job, was not wearing a lab coat at the time....