How long can it go on? Fourteen days into the conflict, Israelis and Palestinians are still answering fire with fire. We knew then that hardliners on both sides were ready to dig in their heels, that after failed peace talks a mere truce was going to be a hard task. What are the lessons coming out of the bloodiest day of the crisis so far? And why are events in the Middle East triggering rioting in Paris and its suburbs? Should the whole world be braced for a burgeoning spiral of intolerance?