From The Guardian:
It’s “the first of the storm”, says Islamic State. And little wonder. For the chaotic scenes on the streets of Paris and the fearful reaction those attacks provoked are precisely what Isis planned and prayed for. The greater the reaction against Muslims in Europe and the deeper the west becomes involved in military action in the Middle East, the happier Isis leaders will be. Because this is about the organisation’s key strategy: finding, creating and managing chaos.