Responding to the OP's original question:

Who's keeping score? TSA? There's no outside independent agency keeping track of complaints. TSA has made it very difficult, in many cases, to register a complaint (procedures differ from one airport to another). There was also an article recently about an FOIA request for complaints that was finally answered - four years later (I think it was an EPIC request).

As long as the process isn't easy and as long as it isn't front-ended by an independent agency, there's no way to accurately measure the number of complaints. TSA has, to date, shown no interest in honest self-policing of its own ranks.

Sadly, if TSA did make the process easy and non-punitive and did follow up on complaints, it would probably improve morale for its own workers, as well as save the agency publicity embarrassments. When a member of the public 'uncovers' a theft ring that has been going on for months (no complaints? seriously?), when a female member of Congress publicly complains about a specific screener at her home airport, when TSOs are arrested for drug/theft rings as the result of outside agency investigation, when TSOs get to work for a manager who was defrocked by the Catholic Church for molesting young girls -that can't be good for the morale of TSOs who are face a suspicious, wary public and who have to live with the negative perceptions of their agency.