Instead of this being an event that terrorizes the world,it may become a point of paradoxical long-term reversal of fortune for the terrorists.
"Instead, the act was delivered as a message to "the
Nation of the Cross": all those seeking the kingdom
of God through the cross. It is a message to those
who reserve their highest allegiance for Christ
crucified. It is a message to Christians baptized
into the death of our Lord, and to those who
would lose their lives for Christ's sake in order to
find it."
http://www.calledtocommunion.com/2015/03/ecumenism-of-blood/