Guantanamo deters terrorists:  Guantanamo Bay and the threat of detention helps deter terrorists. This coupled with the lack of a trial adds to the fear of the place and thus denounces terrorism. What is a deterrent and why is it necessary? A deterrent is something which persuades someone not to act in a certain way. Similar to the accumulation of nuclear missiles actually deterring a war between large nations, a deterrent can be created around something deemed morally wrong (a prison which may/may not breech human rights) and yet help the greatest number of people and is, thus, justifiable. The whole basis of terrorism is formed upon an ideology and stems from indoctrination. If there is a seed of doubt then it is likely that the person in question will not commit acts of terror.