I appreciate the open mind.
And, I think treating them as if they were Americans only helps us maintain the moral high ground. We can say, "We know you are the absolute scum of the earth that supports the killing of women and children. But, being the most tolerant, most free, most democratic, and most law abiding country in the world, we will give you your chance in court without the deck being stacked against you." That, in my eyes, is the ultimate slap in the face to the terrorists. To be ourselves and stick to our distinctly American roots and traditions no matter what they try to do to us. It shows them that we aren't afraid and we won't be pushed around.
It's a shame we didn't kill these dudes when they were fighting in Afghanistan when we had the chance.