Helgoth, Karr, the R's, and others who have been fully 'under the umbrella' all have something in common. They don't characterize the killing. From the POV of the parents, the RN was more sadistic than it was rambling or nonsensical. From the POV of JBR, the garrote and second ligature were obviously more effective than just a prop. Characterizing the killing produces a sadistic killer. There's no evidence that Helgoth, Karr, or the R's are sadistic. In fact, Karr seems to be at the other end of the spectrum.