Like any other sick serial killer, ALL love to keep trophies of some kind - clothing, meticulous records of torture and personal information about the person and the most prized is pictures and videos of their evil handiwork. Why? They get off on it and get to relive it over and over and over again.
May they be in heaven. What they endured is hard to comprehend. Even if I'm not fond of someone, NEVER, EVER, even in a moment of passion would I do something like this to another human being for sport as was done here. These folks were defenseless. I have no doubt that death was a welcomed relief.
It is truly sick...serial killers on a grand scale.