Rishi Sunak became the new Conservative leader on Diwali, the Hindu festival of light. Remember the old joke about a cynical reporter’s story on Jesus walking on water? ‘Jesus can’t swim,’ read the headline. Similarly, to some grubby US-based race-baiters, the UK’s first Asian-heritage Hindu PM, welcomed in his first appearance in parliament as a happy chapter in Britain’s national story, shows its deep racism.