“There are doubtless those who would wish to lock up all those who suspected of terrorist and other serious offences and, in the time-honored phrase, throw away the key. But a suspect is by definition a person whom no offence has been proved. Suspicions, even if reasonably entertained, may prove to be misplaced, as a series of tragic miscarriages of justice has demonstrated. Police officers and security officials can be wrong. It is a gross injustice to deprive of his liberty for significant periods a person who has committed no crime and does not intend to do so. No civilized country should willingly tolerate such injustices.”