The current media interest has little to do with Diane Arbus' photography. It has to do with however they can sensationalize the subject matter and the artist for the "Fear Factor" audiences.
I've admired her work for a long time. The most worn book I own is the Arbus Aperture monograph. I don't read her work as being exploitation any more than Nachteway exploits war or Salgado exploits poverty or Adams exploited the national parks.