Many of you are misquoting the Geneva Convention, much like you misquote the Constitution, because A.) You haven't read it. B.) You heard some other idiot spout out about it, and figured they were telling the truth. or C.) Read about it o n a bumper sticker.
So let me enlighten a few of you about it, although I'll need to stretch the truth and say that the prisoners we have are in fact, uniformed soldiers from their respective countries.
The Geneva Convention was written mainly in an attempt to humanize treatment of POWs. This much most of you at least have a general idea about.
The Second Article describes the uses of the treaty in a variety of situations. The third point of the second article is how it relates to a Signed Dignitary (USA) and a non-signing dignitary (Jordan, Samaria, Iran, Iraq, Afghanistan, etc.) and, I quote
"...Although one of the Powers in conflict may not be a party to the present Convention, the Powers who are parties thereto shall remain bound by it in their mutual relations. They shall furthermore be bound by the Convention in relation to the said Power, if the latter accepts and applies the provisions thereof."
This means that the USA must follow the Geneva Convention until the non-signing dignitary(s) fails to follow as well. With the taped executions by means of beheading of several western individuals, including Daniel Pearl, the non-signing dignitary(s) failed to keep their part, so the USA was no longer constrained by it. In laymans terms: they started playing hardball, America followed suit.
And I'll close by saying you cannot fight a humane war. There is no such thing, and there never will be.