Usage of middle names is common in the media with infamous characters (assassins, etc.) to avoid causing unnecessary problems (and unwanted defamation lawsuits) for the many innocent people who have the same first and last name. Hence, James Earl Ray, John Wilkes Booth, Lee Harvey Oswald.
In Hollywood, to register with the Screen Actor's Guild, you must have a unique name, which is why so many had to begin using their middle names. This is why it seems like so many young new actors have triple names, it's because their names were already taken in the S.A.G. registry.
Several years ago when I was married, one of my wife's coworkers walked in to her job with that morning's paper turned to the obituaries and asked if everything was okay with me. Apparently someone with the exact same first and last name as me (and I have a VERY uncommon last name) had died. The ex looked it over and said, "He better not be dead, his life insurance isn't paid up!" They all had a good laugh at this. The guy was about 10 years younger than me (25 is way too young to die) and more than likely a distant relative. This was a case where a middle name comes in handy.