Nietzche once said that the world has lost much of its charm because we no longer fear it. The attraction of fear though, is central to the appeal of Donald Trump. Fear is linked to curiosity. We experience both when we listen to a ghost story, watch a good horror film or take part in a death sport. Our heart-rate and breathing accelerate, our muscles tense and adrenaline flows. Trump inspires those feelings in his shock opera. He is the greatest show on earth, the man who breathes fire, the daredevil act of the evening. Like the car wreck on the side road, we can’t help but watch.