Fight fire with fire they say. You seem to be doing well :)

Snide remark aside, I'll admit that my comment is not very insightful, because it is pretty much common knowledge. That does not make it any less true though.

The aim of a terrorist is to instill terror in the population. I don't delude myself I thinking you can carry on as if nothing happened, but the measures that are taken should be an appropriate response to the threat, not born out of fear or an effort to soothe the population. If you don't let an irrational fear take hold of you, then all the terrorist efforts have been in vain.

That is also more or less the point of the article, I just laid it out more tersely.