50 years later, some JFK Assassination files remain sealed... why?

HSCA-JFK-wounds-7-117 (Photo credit: Wikipedia)

http://www.newsmax.com/Newsfront/JFK-Probe-Files-Sealed/2013/08/17/id/520923?s=al&promo_code=148EE-1

• JFK in West Tampa four days before he was assassinated (tampataxihack.com)
• JFK: The Smoking Gun documentary claims president was accidentally shot by clumsy secret service agent (mirror.co.uk)
• Dermot O'Leary to host real-time radio show on JFK assassination (alternativenewsalert.com)
• The JFK War: Outing the JFK Assassination Research Bureau web site (veteranstoday.com)