That's bc TSA is all theatre. They fail Homeland Security audits more often then they pass. [1]

It's supposed to give you the illusions of security while giving a DHS a bigger budget, and it employs a lot of low skilled workers.

It is what you should think of when you think "big, dumb government."

[1] https://abcnews.go.com/US/tsa-fails-tests-latest-undercover-...