Scary, voted up.
This can be pushed further: law/moral/ethics are often “holding us back”. The use of dissection of human body has been forbidden/allowed many time in history and this affected our knowledge of anatomy and medicine. Many physical and psychological experiments that have been done before cannot be reproduced today, for they were “unethical”.
It doesn’t have to be Nazis experimentations. Informed consent requires that the person knows that he is under study, which might skew the results.
Some famous experiments were even against the legislation of that time: Louis Pasteur has tested his rabies vaccine illegally.
This vaccine was first used on 9-year old Joseph Meister, on July 6, 1885, after the boy was badly mauled by a rabid dog. This was done at some personal risk for Pasteur, since he was not a licensed physician and could have faced prosecution for treating the boy. However, left without treatment, the boy faced almost certain death from rabies.
True, but that “one kind of rationality” might not be what you think it is. Conchis’s point holds if you use “rationality” = “everything should always be taken into account, if possible” or something alike.
A “rational” solution to a problem should always take into account those “but in the real word it doesn’t work like that...”. Those are part of the problem, too.
For example, a political leader acting “rationally” will take into account the opinion of the population (even if they are “wrong” and/or give to much importance to X) if it can affect his results in the next election. The importance of this depends on his “goal” (position of power? well being of the population?) and on the alternative if not elected (will my opponent’s decisions do more harm?).