While the loss of life of ~3k people, once, is regrettable, it is by no means an event worth the response that has occurred. Sometimes, you are just unlucky, and we aren't going to reconfigure entire systems at enormous cost when it is unlikely the event will happen again. It is very hard for people to internalize this. "Do something!" and what not. Armoring flight deck doors would've been sufficient to prevent a recurrence. Instead, the TSA spends ~$8B/year and employs ~60k federal workers. For 3k people who died once.

Conversely, there are ~40k-50k gun deaths annually in the US, and we do nothing, despite that being a much greater risk than an air transport terror attack.

https://www.pewresearch.org/short-reads/2023/04/26/what-the-...

https://www.gunviolencearchive.org/

You've already gotten a very clear answer:

The TSA:

1. Expends a lot of money, and a lot of passenger time;

2. Without producing any benefits.

Thus, eliminating the TSA is pure upside.

Your question is irrelevant to the topic, because the TSA does not oversee what people bring on airplanes.

The ONLY response to 9/11 that has done anything is the change in cockpit door construction and procedure. Everything else is completely worthless. I know this sounds nuts but I really do not care if someone sneaks a tiny hooker pistol or a swiss army knife onto a plane, they're not going to be able to do anything other than piss everyone off and get beaten to a pulp by a bunch of people who had their travel plans interrupted, should they decide to do a terrorism.

Also, fun fact, the TSA doesn't actually care about any of this. They're mostly concerned with large bombs and have lobbied to not have to chase after every pair of nail clippers but the flight attendants union has successfully counter lobbied to prevent this. They don't want to be stuck in giant metal tube trying to convince 200 irate people to pay $5 for a can of Fanta and to sign up for the latest credit card if anyone is armed with so much as a spork.