"As I have remarked about a handful of other books, such as People of the Lie: The Hope for Healing Human Evil or The Emotional Rape Syndrome: How to Avoid and Survive It, any psychiatrist making use of words such as evil, monster, and any other metaphysical terminology already always puts me on edge.
I shudder to refer to this dude as "doctor" but... Dr. Stone and his co-writer claimed to have studied about 600 serial killers to create their scale of "evil."
The information I have is that this book was written within the span of about a year. So that would amount to roughly one serial killer case looked into a day. Naturally, Stone and his buddy may certainly have done more thorough investigations into a number of cases throughout their careers beforehand or assessed and treated a number of offenders but it would come nowhere near the number of 300.
So... very unsurprisingly this is how you end up with Kemper being paired with Bundy on the highest end of the scale, which should make any long-standing True Crime/Bundy/Kemper researcher skeptical about Stone and said scale anyway.

Throughout the book I stumbled upon a few not only very questionable but long debunked Freudian ideas which made this an especially frustrating read for me.
I am not quite certain why there are so many psychiatrists his age who at some point in their professional lives just appear to have decided, "Aeh, I think I know enough, no need to educate myself further and stay up to date with the latest scientific findings and conclusions," but clearly the author still subscribes to Cleckley-esque, Freudian and 70's ideas and diagnoses.
Reading this book felt a bit like poisoning my mind, and frankly, there is no more polite way to put it.
The amount of people buying into this nonsense or having chosen this as their first psych/True Crime book and carrying all this misinformation back out into the world is simply scary and irritating. "