'It's just gotten crazy': how the origins of Covid became a toxic US political debate

White House official John Kirby, standing at the podium where Donald Trump once railed against the "China virus" and praised the healing powers of bleach, faced questions on Monday about the origins of Covid-19. He had no choice but humility. "There is not a consensus right now in the US government about exactly how Covid started," Kirby admitted. "There is just not an intelligence community consensus." The renewed interest in a genuine scientific mystery followed a report in the Wall Street Journal that the US Department of Energy had determined the coronavirus most likely leaked by accident from a Chinese…