If Donald Trump really wants to save Hollywood, maybe he needs to venture outside his comfort zone and watch more European art house cinema. The Cannes film festival, which closes on Saturday, is in many ways the very definition of the “globalism” that the American president’s Maga movement despises. Walk past the queues snaking alongside the Palais des Festivals and you hear languages and accents from every corner of the globe. The Marché du Film, where industry professionals strike their deals, is brimming with smart people from all over the world beckoning US producers with irresistible tax incentives – resulting...