How much damage has the unrest in France caused to a protest movement rooted in genuine grievances but hijacked by rioters, violence and vandalism? Is it a gift to Marine Le Pen, the far-right leader and presidential frontrunner? Or is it a spectre of trouble to come in a deeply polarised society, amid an increasingly poisonous political atmosphere? France 24’s Gavin Lee speaks to French analyst Renaud Foucault and a senior professor of economics.