Look Micro, you just don't understand: proving guilt in cases where the government may not have any evidence is difficult. Therefore, the executive needs the power to just jail people forever without having to prove anything. That way, we'll be safe, because no terrorist will be able to deprive us of our liberty or life arbitrarily. Only the government will be able to do that, and we all know that government never abuses that power.
Back to reality: The fact that the government is releasing something like 30 percent of the prisoners is proof that there never were anything approaching stringent requirements for jailing people in the first place. When the government has already admitted that it didn't carefully select who went to Gitmo in the first place, how on earth can you believe it's a good idea to just let the government keep people in jail forever without having to prove anything?