If Mohammed is really the mastermind of 9-11 the government’s evidence is so strong, why wasn’t Mohammed tried?

If Mohammed is really the mastermind of 9-11 the government’s evidence is so strong, why wasn’t Mohammed tried years ago ? Why was he held for years and tortured—apparently water-boarded 183 times—in violation of U.S. law and the Geneva Conventions? How can the U.S. government put a defendant on trial when its treatment of him violates U.S. statutory law, international law and every precept of the U.S. legal code? Mohammed has been treated as if he were a captive of Adolf Hitler’s Gestapo or Joseph Stalin’s KGB. And now we are going to finish him off in a show trial.