Are you suggesting that TSA can reliably stop being from bringing guns onboard?
The only thing preventing that is that people mostly don't want to bring guns on board. It's a pointless exercise that accomplishes basically nothing .
Are you saying metal detectors don’t work? Why is it that absolutely every airport in the world has similar security - as well as Brightline in Florida and the Chunnel between London and France?
As far as people not wanting to bring guns on planes - did you forget what country this is? 2nd Amendment people get their panties in a knot anytime they can’t bring a gun anywhere.
DHS routinely tests TSA and they always fail spectacularly. This was just the first one on Google. You can easily find many more, this is widely reported on.