I disagree... for example... the restriction on liquids was in direct response to the Atlantic Bombing Plot.
In the same way, the Bojinka Plot (in which Khalid Sheikh Mohammed and Ramzi Yousef planned to detonate bombs in multiple airliners) resulted in airline security measures changing so that luggage would only be put on an aircraft if the owner of that luggage was on board.
Meanwhile the events on FedEx Flight 705 resulted in changes to rules governing jumpseat passengers.
The history of aviation is full of examples of threats to aviation resulting in changes to security measures.
You are right.
Still, the whole strategy of implementing controls tailored to specific security incident is wrong and ultimately useless, if only for an economic standpoint.