"But policies adopted under conditions where all sides have a right to be heard carry the legitimacy they do precisely because free discussion and debate increase people’s confidence in the conclusions that are ultimately reached.... Whether in science, in a criminal trial, or in society at large, there is no reason to trust a conclusion that was reached without access to and consideration of all of the relevant information—the very information that censors wish to suppress.... Trying to see the argument from the other side is hard work. But then, governing a heterogeneous nation of more than 300,000,000 is hard work, and in our political system, we all share in that responsibility."