One day over the summer, Piers Corbyn picked up a punnet of strawberries in the Aldi supermarket in Greenwich. He then went to the help desk and placed £1.19 in change on the counter. The controversial climate change denier and anti-vaxxer (and brother of former Labour leader Jeremy)—who, during the pandemic, released an unspeakable music video in which he sang “wearing a mask is like trying to keep a fart in your trousers” (the research is awaiting peer review)—was making a political point. Thi...