Review at a glance T he Venice Film Festival has had a plethora of assassins in its competition films this year, from Woody Allen’s Romanian goons in Coup de Chance to David Fincher’s vengeful hitman in Killer and Richard Linklater’s faux gun for hire in Hit Man. But the festival has also screened more insidious and far more successful killers via Matteo Garrone’s Io, Capitano, about a young man trying to reach Italy from Senegal. In this case the killers are the traffickers and mafiosi the hero encounters on his arduous journey. But in the astounding Green Border, Agnieszka Holland...