Sadly these kinds of actions are going to continue to rise. ISIS is the greatest threat humanity has faced since Hitler, and yet people refuse to see it, bury their head in the sand or say this has happened because of this or that (maybe it did, but that is gone, its about what we do now).
All this pussy footing around about what should nations should do against them has allowed them to grow and spread their message of hatred exponentially. Air strikes alone are never going to solve anything, they haven't in the past and are proving they aren't now.