“Black lives matter” was the slogan chanted last July at a demonstration against police violence in Paris. While the world’s eyes were on the US, where two black men, Alton Sterling and Philando Castile, had been killed by white police officers, thousands gathered in the French capital to protest about the death of Adama Traoré, a 24-year-old Frenchman who suffocated after being arrested by gendarmes during an identity check.