[Edit: ptaipale discussed that here: https://news.ycombinator.com/item?id=12738768 too.]
Unlawful combatants don't have access to the rights under war laws, except Article 3 of the Geneva Conventions (see quote below).
Hence, the question is not if you treat them as POWs or as civilians -- but if they have the protection of a POW at all.
That is more than enough to show my argument correct.
https://en.wikipedia.org/wiki/Unlawful_combatant
The Geneva Conventions do not recognize any lawful status for combatants in conflicts not involving two or more nation states. A state in such a conflict is legally bound only to observe Article 3 of the Geneva Conventions and may ignore all the other Articles. But each one of them is completely free to apply all or part of the remaining Articles of the Convention.[6]
Since you have no foot to stand on -- bye.
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(A note that doesn't matter for my argument: Out of interest you might want to read this and the "See also" for the page, especially the "No longer enemy combatant" link: https://en.wikipedia.org/wiki/Unlawful_combatant#Internation... The US Supreme Court seems to agree that unlawful combatants should get protection by the Geneva Conventions -- but this doesn't matter for my argument anyway.)