- 9/11 was a one-time thing, it only worked because the passengers would assume that as long as they cooperate they would get out alive. Without that "cooperation" 9/11 would have not happened (remember the 4th plane that was brought down because the passengers learned what happened)
- Liquids. There was the potential that someone could mix together some liquids to make an explosive. It never actually happened, and the possibility was solidly debunked later. Yet, our lotion is still taken from us... And dumped right in the garbage near the most populous location in an airport.
- Shoes. One failed attempt. One. Years, later we still need to take our shoes off.
It's a security theater. Some of it obviously necessary, some of it just to make us feel safe.
Meanwhile way more people die on their drive to the airport than from any flight related incidents.