The action can be timed a few days before election or other important political occurance in the targeted region.
The method can work only on ethnic or religious rift. The desired effect is win-win situation. If enemy scared and retreats - all is good. If enemy angered and attacks - it is good too, because as a result the rift deepens.
The inventors don't really understand that on the bottom of Western culture lays a sleeping beast. Random attack without backtrace risk to awoke it, because this type of attack hits the main pillar of Western society - idea of personal responsibility.
Hope the awakening won't happen.