Not a great example to use- post 9/11 air travel changes have been widely panned by security researchers all over the world. It even coined a new phrase- "security theater". Lots of bluster and visible inconvenience, with almost nothing achieved.
The "take off shoes" thing is a prime example. One halfwit would be terrorist (Richard Reid, the "shoe bomber") lengthened security procedures for at least tens of millions of people all over the world, per year. Probably more.
Basically, the terrorists achieved exactly what they wanted by the way societies reacted.