In each generation, for different reasons, America witnesses a tug of war between the instinct to suppress and the instinct for openness. Today, with the perception of a mortal threat from terrorists, the instinct to suppress is in the ascendancy. Part of the reason for this is the trauma that our country experienced on September 11, 2001, and part of the reason is that the people who are in charge of our government are inclined to use the suppression...