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If the government snatched you off the street tomorrow, could you prove that you were NOT a threat? Should you have to? It can't be done!
Shouldn't the government at least have to provide SOME credible evidence that you DO pose a threat? That you WERE "attempting terrorist acts" or (heaven forbid!) "fighting against us in Iraq".
And if the government can't provide ANY credible evidence that you WERE doing these things, then how long should you have to stay in the cage?
People don't get very excited over legal niceties like "habeas corpus". But just imagine yourself caught up in the kind of situation where they apply...