If the TSA was being properly run, the only time the public would see a TSA uniform is when some punk with ties to a terrorist organization tries to board a plane.
El Al wrote the book on this. Buy an El Al ticket, and you sign a waiver allowing them to investigate you.
The underwear bomber tried a weaponless dry run on an El Al flight. They put a Jewish US veteran in the seat next to him, and issued him a flare pistol with a low pressure 12 gauge birdshot round … who spent the entire flight glaring at him while he kept his hand in his jacket pocket.