Unelected pundits unceasingly tell us democracy is in danger. Yet as voters grit their teeth for a Biden-Trump rematch, they might wonder whether democracy is such a great thing in the first place. Was it all a mistake to ditch George III for this? The U.K. has free elections just as we do. But when a prime minister is as unpopular as, say, Rishi Sunak is right now, nobody worries that…