For those that answer "It depends on the evidence", you've fallen into a logical fallacy. There can be no 'evidence' properly reviewed without a trial. Being held without a trial, these folks never get their evidence reviewed by a court, only by the prosecutors building the case against them. In many cases the most evidence they have are the 'confessions' gleaned from these people following days of torture. Torture anyone enough and they'll tell you exactly what you want to hear just to get the torture to stop.
That's why the Spanish Inquisition loved torture after all.
I have no problem locking terrorist fighters away for the rest of their lives. Heck, I have no problem executing them either. What I have a problem with is holding them without having given them a fair trial. We are a nation founded on laws. To ignore our laws and customs with anyone, citizen or not, enemy or friend, we become less than Americans, we become our enemy and our enemies win by destroying what it means to be an American.
It can never be quoted enough, especially as we come up on the fourth of July, our Declaration of Independence:
QUOTE
We hold these truths to be self-evident, that all men are created equal, that they are endowed by their Creator with certain unalienable Rights, that among these are Life, Liberty and the pursuit of Happiness. — That to secure these rights, Governments are instituted among Men, deriving their just powers from the consent of the governed, — That whenever any Form of Government becomes destructive of these ends, it is the Right of the People to alter or to abolish it, and to institute new Government, laying its foundation on such principles and organizing its powers in such form, as to them shall seem most likely to effect their Safety and Happiness. Prudence, indeed, will dictate that Governments long established should not be changed for light and transient causes; and accordingly all experience hath shewn that mankind are more disposed to suffer, while evils are sufferable than to right themselves by abolishing the forms to which they are accustomed. But when a long train of abuses and usurpations, pursuing invariably the same Object evinces a design to reduce them under absolute Despotism, it is their right, it is their duty, to throw off such Government, and to provide new Guards for their future security. — Such has been the patient sufferance of these Colonies; and such is now the necessity which constrains them to alter their former Systems of Government. The history of the present King of Great Britain is a history of repeated injuries and usurpations, all having in direct object the establishment of an absolute Tyranny over these States. To prove this, let Facts be submitted to a candid world.
It does not say "All Americans", it says "all men are created equal". Whether American or foreign, terrorist or British, all men are equal in their creation. They possess certain inalienable rights that should only be taken away with the full due process of law. Our law, our Justice.
The War on Terror is not just a war of armies and bombs. It is a war of concepts and ideals. Al-Quaeda fights not just against our soldiers and our citizens, but on our way of life, our system of justice, and what it means to be an American. That is what they hate more than our armies and our technological bombs. When we change what it means to be an American, when we renege on our system of laws and our system of justice, when we thumb our noses at our very own Declaration of Independence, Al-Quaeda laughs and jumps in joy at their victory for they have forced us to change what it means to be an American. They have forced us to become more like them, and they win a victory against us.