America shouldn't have the right to execute them. Regardless of their crimes. Their government has the ultimate descision as to who dies and who does not.
Afghanistan currently has no Government. Sir.
It's been pulverized so much it no longer exists. So, technically, if we capture one of there terror dudes, if this is taken up to the Federal Court, then we have every right to hold a case and charge him and give a sentence, which is most likely death.
Also, if it were a US citizen who did 9/11, wouldn't that count as Treason against the US?