A terrorist assault on a Hanukkah celebration in Sydney, combined with Germany’s arrest of five suspected Islamist militants accused of plotting a Christmas-market attack, is renewing fears that Western democracies are entering a more volatile era marked by ideologically driven violence. The incidents, striking symbolic holiday gatherings on opposite sides of the world, have intensified debate across the United States and Europe over whether open societies are prepared for a resurgence of extremist threats.The sense of unease deepened further after an ISIS-affiliated gunman in Syria killed two...

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