The primary purpose of terrorism is making people fearful in their daily life. People who live in less populated or away from landmark places feel a bit more secured, but it's always there in the back of one's mind when something goes on that comes off as suspicious regardless.
Nevertheless, society gets on with their lives. I don't think this is about a patriotic or unified spirit, which is more poetry in my opinion, so much as it is simply the natural response of an apex society. Terrorists could never really break that- not to offend the tragedies of the attacks from 9/11 to Paris, but radicals are so abysmally narcissistic to a point that these things rub off as being more than what they are. In reality, they haven't done anything except hand-toss a bullet into a brick wall as far as these attacks go.
The real weapon isn't their terrorism, it's their multiplying in Christian society. This is why it's not a good idea to be bringing in hundreds of thousands of Muslims- they are programmable people for an Islamist state. This is exactly the cause of the Paris attack- it's not some coincidence that France has an extreme population of Muslims.
So let's get to the brass tacks- if you follow the much overblown 'Christian way', which is really an invention of the past several decades to harbor faulty pacifism, then you're opening the doors for destruction. It isn't God bombing ISIS right now, it is us. Our protection is what God gave us for protection. I think that many Christians need to embrace the reality of having to make tough calls and pertain to a greater good rather then consistently remaining in a paradigm of putting band-aids on gaping wounds.