Out of interest, did I not read the linked-to article correctly? From what I could see, there was no actual indication (nor, admittedly, refutation) that any body scanner images were involved.
There was a mention of an incident of alleged impropriety in a patting down procedure (unrelated to the issue at hand). If true (and, from this side of the pond, I can't tell if this is just the stereotypical tendency towards litigious action brought about after an honest misunderstanding, or not) then that's a problem that exists with or without scanners (indeed, would be displaced by increased scanner use).
In-person or scanner-mediated inappropriate behaviour is as bad, of course. Across all positions of trust, from teachers to babysitters to youth club/organisation workers. It seems to me, though, that a bad egg who happens to be involved with the backscatter-scanner project is being used to support the idea that the scanners are bad.
If (and it wasn't established that this is the case) the memory stick contained images from the scanner itself, then the ability to arbitrarily download them (as opposed to the option of storing "images to be used as evidence" in a form that could only be court-unlockable) is a design flaw, but not a problem with the scanner itself. (Ideally, anyway, the scanner pinpoints the need to strongly request an actual search, and "looks Ok" images would never need to be stored, certainly not transferred anywhere.) However, unless I've skipped some vital verb or adjective in my haste to not dwell upon the unpleasantness of the person involved, the article appears not even to suggest that such transfers had happened.
On the whole, the core issue is not a subject I would normally have come to read about, but you drew me in with the promise of some healthy cynicism about some subject or other. After which I wrestled with myself over whether to follow the link (what with it's more plainly descriptive URL). So forgive me if my cynicism isn't about the target of the article but instead the motivations behind the article, itself!