The entire question of how to treat terrorist captives rests on a fallacy. People who have never read the Geneva Conventions somehow believe that “enemy combatants” are the equivalent of soldiers. They are not. They are subject to drum-head trial and immediate execution. Unless you are in uniform, or bearing a distinguishing mark such as an armband or other device, you are what was referred to in the conventions as a “Francs-tireurs.”
The U.S. and allied military forces have the legal right to try and execute individuals who are caught in arms without the protection of uniform. Similarly, pirates are “against all flags” and are, by international convention subject to similar penalties when caught; ditto slavers.
Astounding sympathy has been lavished on these murderers and religious fanatics. I hope they do not confuse kindness with weakness. As is well established, weakness invites attack.