TSA is saving some of those body image scan pics they said they wouldn't save

But don't worry, they're only saving the 35,000 pictures that supposedly don't show anything - they won't save the really scary photos, like the one above (they say) - but why are they saving any of them at all, when they said they wouldn't? And why did it take a Freedom of Information Act request to find out that they were breaking their own promise, if they're not up to anything nefarious?

(Here's Chris' earlier post on why body scanners don't even work anyway.)