I guess people are not supposed to notice that every terrorist attack represents a major government failure and that rewarding failure with more of the same policies only invites more failure.
I am sure a frightened population will find government promises of perfect security attractive and may be willing to allow more surveillance of their personal lives. They should pause a little beforehand and consider what their governments have done so far to keep them "safe."
The government of France, for example, has been particularly aggressive in its Middle East policy. Then-French President Sarkozy was among the most determined proponents of "regime change" in Libya. That operation has left the country in chaos, with much of the territory controlled by an ISIS and al-Qaeda that were not there before the "liberation."