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Yes, I think the US is going to have to keep such facilties for the immediate future until some kind of international agreement can be hammered out on how to deal with the phenomenom of the "global terrorist". I do not see this as any different (other than in scale) than what went on in the cold war with the capture and rendention of spies from both sides.
Is it right or wrong? The answer at this point is that it is grey. The potential for a few people with little scruples but lots of belief to do grevious harm to hundreds or thousands of others through the miracle of modern technology is all too real. And at this point, short of a scorched earth policy, I don't really know how to deal with it - since the ideological basis for these actions is not being addressed seriously by any government on earth as far as I can see.
As far as the US goes, I just wish we had a special court system to deal with this - a dark one like we have for national security affairs. It is not a good solution at this point, but it would be better than what we have now, and at least it would give some oversight. But at this point, I see much of this fight taking place in the dark places of the world. I do not want to see the attitude of "kill them all and let God sort it out" come to the fore either. Until someone comes up with a better solution than Guantanamo - then hold your nose and let it be.