Or even more recently Ryan Lanza at Sandy Hook http://en.wikipedia.org/wiki/Ryan_Lanza#Investigation
The media doesn't learn and doesn't care to learn.
Christopher Jeffries http://www.guardian.co.uk/uk/2012/mar/16/christopher-jeffrie...
Oz: Lindy Chamberlain http://en.wikipedia.org/wiki/Lindy_Chamberlain-Creighton
Countless others, and one of the reasons why death-penalties can kill the wrong person
The people who turn it into a witch hunt are likely not the people actually using their heads enough to know what to be looking for in the images.
The problem is that all it takes is one group to start quoting the other, and the effect starts to snowball:
"Internet detectives on the popular website Reddit have identified three possible suspects..."
"[Rival news organization] tonight reported on three new leads. The suspects, Joe Bloggs, Susan Smith and Bill Stickers..."
"Ask Reddit - who of the three suspects do you think is most likely to be behind the attacks?"
http://www.huffingtonpost.com/2013/04/16/mystery-man-on-roof...
Edit: It's another picture though.
I don't think they needed to learn anything. They know it's bad to jump the gun. You still see "Dewey Defeats Truman" jokes.
They just make mistakes. It's easy to criticize a nameless faceless concept like "the media". Individuals in the media are largely upstanding people trying to do the right thing.
With recent news about someone "watching a race while brown" (an injured Saudi's home is searched while he's being treated for injuries) I don't hold a lot of hope for accurate and careful policing.