Filipino director Brillante Mendoza’s social realist drama takes us to the dark heart of police corruption in Manila, but never really gets inside the victims’ headsThe Filipino director Brillante Mendoza is one of Cannes’ established auteur film-makers, and his new movie here, entitled Ma’Rosa, returns us to the themes of his violent shocker Kinatay from 2009 — the cynicism and corruption of the police and the city authorities, the casual violence and the desperation of the ruled-over who must make what accommodation they can with those in power.