I chose your article instead one of the other five or six listed on my search engine; because yours was the only one, which gave a complete list and description of each level of Dr. Stone's depravity scale. I think, like myself, that is what the readers, the ones who gave such unexpected responses, were after. Dr. Stone may have a website, but I haven't found it yet.
I believe that Dr. Stone's attempts to simplify the sentencing process for juries is misguided. I am not an attorney. I am a social worker. As a social worker; I have extensive experience working with convicted murders and other types of violent offenders.
Tonight, I am viewing a documentary on Dennis Rader, aka BTK. I believe that Dr. Stone would definitely place this individual very high on his scale, perhaps a 22. BTK tortured his victims for the purpose of sexual gratification. He is clearly a sociopath. His crimes are inexplicable. But can all of his acts be chalked up to free will, to evil? I'm sorry I think that's a cop out. Until we understand why individuals commit such inexplicable acts; we will be unable to stop them from reoccurring. What we do know is that those who do commit such acts are clearly not in their right minds. So, what makes Dr. Stone or anyone else think that harsh punishment will be an effective deterrent. Execution is supposed to be a deterrent, right? We don't execute out of a need for vengeance, do we? After all, acts of vengence are "evil", acts, aren't they?
Perhaps this is not the type of discussion you hoped to generate with your article. Perhaps you wanted to keep things strictly legal. In this case; I don't think that's possible.