‘It’s a new world. It’s a little fascistic. And it needs a different response’: U2 on 50 years together – and their undimmed faith in humanity

After some so-so albums, can U2’s new one, Carnaval de Luz, restore them to glory? They discuss male egos, working with Dolly Parton, and explain why, despite Trump, they still believe in democracy – at least in their bandLa Petite Maison, in Nice, has a certain reputation as a five-star celebrity haunt. Beyoncé eats here. So do Elton John, Tom Cruise, Harry Styles and Leonardo DiCaprio, their meals presided over by the restaurant’s founder, Nicole, variously described in print as “eccentric”, “unique” and “truculent” (she’s standing by the entrance when I arrive, and suffice to say, doesn’t look like someone you’d much enjoy being on the wrong side of).It’s enough of a celebrity haunt that the arrival of U2 – still incontrovertibly one of the biggest bands in the world 40 years after they could first reasonably have called themselves such – causes barely a murmur of interest among their fellow lunchtime diners. Then again, Bono is a regular. He was eatin