[hummusandsushi]

The name for this effect appears to be the "Preparedness Paradox" [1]. The effect where people attribute the minimal or reduced harm due to some problem to the problem not having been that serious, instead of attributing it to the essential work performed by other people to prevent the worst disaster.

A very funny depiction of this effect is in the hilarious episode "Charlie Work" of It's Always Sunny in Philadelphia where the titular Charlie Kelly works tirelessly to have their bar pass health inspection, only to have the other main characters shrug and say "But we always pass health inspection".

[1]: https://en.wikipedia.org/wiki/Preparedness_paradox

[noduerme]

See also: Absence of airline terror attacks in the US since 9/11/01.

[AnthonyMouse]

Nope, there is only one single thing that has prevented that since 9/11, everything else is security theater and BS.

On 9/10/2001, the assumption was that if someone was trying to hijack a plane, they were planning to ransom the passengers as hostages, so you should let them take over the plane so the hijackers don't hurt the passengers who fight back.

As of 9/11, the assumption is that they want to fly the plane into a building and kill everyone on it, so if someone tries to hijack a plane, everyone on the plane knows to fight them to the death with suitcases and shoelaces and now you can't hijack a plane anymore so there is no point in trying.