A good start is interrogation with the aid of drugs.
Taliban commanders today said they have captured 25 followers of Zahir Shah, Afghanistan's exiled former king. The Taliban military government of Afghanistan says "some of the important people" among the 25 prisoners "may be hanged later today in Kandahar, though it is possible that they may be hanged in Uruzgan."
I want to see stories like that, "We have aprehended to terrorist suspects and they will be hanged in New York City, or maybe in Washington later today."
To these terrorists and their sympathizers, other treatment would be cruel and unusual.
Hank