The media is obligated to use full names as it differentiates people with common names.
You can see this at work when, for whatever reason, killer Joel Rifkin was only referred to by his first and last name for a long time in the tabloid press. Lots of people share that name and it was unfair to them to be associated with a killer. There was actually a Seinfeld episode making fun of this as it became a problem in NY which has a lots of Rifkins. Now he's typically referred to as Joel David Rifkin.
I had a friend named Adam Moss...at his wedding, his father-in-law related the shock he had in learning, via an Internet search, that the man his daughter had fallen in love with was recently apprehended as a mass murderer: http://siouxcityjournal.com/news/local/adam-moss-who-killed-...
Police reports and other legal/municipal documents usually contain middle names, so that's why we often know famous criminals (e.g. Lee Harvey Oswald) by their full names.
The media seem to prefer that formulation of his name, because it sounds creepier.
This is the best news article: http://www.latimes.com/local/lanow/la-me-ln-20160624-jenning...
And this is a great blog post: http://mimesislaw.com/fault-lines/prosecutors-ask-court-to-r...