Why would someone want their rights being protected while they are not protecting other's rights? When it comes to enemy combatant, there is more than greencard and citizenship at stake. The lives of the enemy combantant as well as the lives of many are at stake.
From my personal experience, the American system of justice and government are the most fairest in the world states today. Even though we may point to flaws and injustices in the system, still the system remains the most just in the world today. All need is be just person in all manners and to all people, regardless, and you are safe regardless of your status, but if you want to get an apportunity to kill people, then you will have more to worry...
Just expressing my opinion...