Why Are People Linking to a Four-Year Old Story On Anti-Vaxxers?

The story is from the Atlantic:

Wealthy L.A. Schools' Vaccination Rates Are as Low as South Sudan's

And is dated:

Olga Khazan

Sep 16, 2014

Its source is The Hollywood Reporter story "Hollywood's Vaccine Wars..." which itself is dated

9/10/2014 9:00 am PDT 

Since last week it has been linked in a half dozen places.

None of the linkers mention the date and none of the linkers dig further into the story with updates on the effects of the California immunization law which actually is a story:

Medical Xpress: "Vaccine opt-outs dropped slightly when California added more hurdles"
KPDB: "Medical Exemptions Up As Vaccination Rates For Kindergartners Decline In State, San Diego County"

and a bit spookier from The Sacramento Business Journal:
ICAN vs. HHS: Key Legal Win Recasts Vaccine Debate

What's up?
You've got record measles outbreaks in Europe and mumps in the U.S. who (WHO?) needs old news?