I found that part so chilling.
I agree, he wanted to look at the pic so he could relive his crimes ove ,and over again.
Even after he had already murdered them all he still seethed with abnormal anger, rage, and hatred.
That showed through when he relished in trashing Summer to everyone who would listen.
Killing them all wasn't enough for him. He had to continue to victimize.
All of this does give us a creepy glimpse into his mindset even after murdering them all.
IMO, He certainly has traits of a psychopath. This is how he was able to con victims for years with ease. No conscience.
Its how he was capable of murderering 4 people. They have no emotions or feelings/attachments for others, other than themselves.
They do fake or try to mimic normalcy by watching what other people do.
Even that may come across as strange, when they do it at times, because a person has to feel it, for it to be believed, as a normal response.
A perfect example is when he saw nothing wrong whatsoever with trashing Summer publicly for all to hear, when anyone who is not a psychopath would know that is very bizarre response, Especially when someone's best friend, and his entire family had vanished.
Yet he thought it was perfectly acceptable to do.
Like Mrjitty said, he felt entitled to do everything he did.