I have not read the report itself, just the AP story on it, but I cannot say I am surprised. Airport security here is largely handled by private contractors. The people they employ are not able to get better jobs than the mind numbingly dull routine of staring at a screen and trying to spot a pair of nail clippers. They are poorly paid, poorly trained and hard to motivate.
The bombers meanwhile have moved elsewhere. Transit is now one target of choice. There are no screeners, and it is a lot easier to get a back pack of explosives on to a tube train than hijack a plane or set light to your shoelaces. Of course the subsequent video is less dramatic - but the atmosphere of terror is pretty much the same.
The TSA agreed with the investigators' recommendation to introduce "more aggressive, visible and unpredictable security measures," as well as the recommendation to deploy new detection technologies.
I am not sure I like the sound of "aggressive" - these people are uncivil enough already.