Leuyen, one very very salient point you are failing to take into account is this: The Government Makes Mistakes.
You say you have no care about aliens held for indefinite periods, subject to harsh interrogation methods, etc. as long as they're not US citizens. Well, what if they're innocent? Have you heard of the case of a certain Canadian citizen? He was absolutely innocent of any wrongdoing whatsoever, yet his name was somehow put onto a terrorist list. He was stopped in New York on his way back home, during a stopover before the final leg of his flight. With no ability to contact anyone once he was taken into custody, he was arrested, and shipped off to Syria via the CIA secret prisons program. The Syrians then proceeded to torture him, physically, for about 2 months, and he was kept in custody there for 10 months in a cell the exact dimensions of a coffin 24 hours a day, in solitary confinement in complete darkness. He was only released because of political pressure from the Canadian government, because he had relatives who apparently had some clout.
Now, what are you going to do about the next such case? A man who has done NOTHING WRONG, who the US puts into custody, where he is beaten and tortured, etc. and now he has NO WAY WHATSOEVER to challenge his imprisonment.
I'm sorry, but that's unconscionable. I don't care that these people are aliens, they should and MUST be accorded the same rights as any one of our citizens would be. The moment you abrogate what formerly used to be a universal law with "Well, it's universal... except for 'THESE PEOPLE'" you have opened Pandora's box. It becomes a much much easier step to "Well, it's Universal... except for 'THESE PEOPLE' *AND* 'These Other People We Just Added to the Non-Universal List'". And then some time later a 3rd group is added. And a 4th. A 5th... and pretty soon, we all lose it.
No, I say. Habeus Corpus is a fundamental right of ANYONE in a civilized society, and denying it makes us less than civilized.
-Arlos