That's fallacious reasoning. Just because they were treated wrongly in one way does not mean it becomes correct to mischaracterize "anything regarding their detention."

And Guantanamo prisoners are getting habeas petitions heard: http://ccrjustice.org/GTMOscorecard. It's not happening fast enough, and partly for logistical reasons (no U.S. state wants to host trials for them and foreign countries don't want them back), but it is happening.