In Emmanuel Macron’s book Revolution, published ahead of the 2017 presidential election that he went on to win, he promised to restore hope to a country that was losing faith in its future. As Mr Macron’s lame-duck second term enters its last phase against a quasi-insurrectionary backdrop of torched public buildings and looted shops, the failure of that political project appears total.

The worst scenes of urban violence for years overshadowed a weekend of protest that gravely undermined what is left of the French president’s authority. As police lost control of the streets, more than 2,000 shops were ransacked. Far-left groups targeted town halls and local buildings, and engaged in pitched battles with the police, whose disastrously heavy-handed response to last week’s high school protests has succeeded only in escalating tensions.

In a........

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