Why does Rivals’ high-camp, warts-and-all frolic through the 80s make Zoe Williams feel so nostalgic? Is it wrong for Elon Musk to offer voters $1m to get Trump elected? ‘I was blown away by how meaningful and interesting it is: one woman’s ‘love story’ to the caring profession. And Philippa Perry advises a reader to be more forgiving to a friend who is a perpetual liar