Do you mean at a Govt or population?
I would suggest that many knee jerk things implimented post 9/11 could be seen as fear on a govt level. a huge increase in road deaths as fear on a population level.
The Madrid bombing forced the govt to revise a policy that the population was against BEFORE the bombing... but you can travel through and from Spain without no fly lists or "do you want KY jelly on the rubber glove or do you prefer to be searched "Au natural" sir?"
best
Chris