It is important for me to know the Why as well! In my earlier postings I mentioned some of the profile characteristics of the Anger-Retaliatory Rapist.
Things like the victim was killed by Overkill, sloppy crime scene, evidence thrown, if the perpetrator has planned it in advance he overstocks on weapons and ammo...the list goes on in similarities to this case. One paragraph in the book" Psychology of Serial Killer Investigations"- Keppel/Birnes added some more possible insights, to why someone who has done such a brutal crime would show emotions or even possibly cry after a brutal crime like this. The book states on page 156-157:
"When the subject views the sexual assault and murder as a success, He often leaves the crime scene with a feeling of having been cleansed and renewed. Because the subject has transferred the blame of the murder onto the victim, he does not experience any sense of guilt. Accordingly, he does not own any feelings of wrongdoing. In fact, quite the contrary is true. That
is, he can develop a sense of sentimentality over the victim and help search for the victim with
tears in his eyes (Keppel and Walter, 1999)
link below - scroll down to page.... Anger-Retaliatory Rape Profile starts on page 155
some characteristics also have similar patterns to Power Reassurance Rapist.
http://books.google.com/books?id=2d...age&q=Power-Reassurance Rape-Murderer&f=false