Diane Abbott addresses an audience of supporters during a Labour rally in 2019. Photograph by Chris J Ratcliffe/Getty Images. It is easy to swiftly dismiss a newspaper column – through a tweet, a private message, a Facebook comment. Something visceral is triggered in us, and we want to scratch that itch. But writing a letter in response to one takes time and effort; it is not a thoughtless exercise. In response to my recent column for the Observer – in which I argued that racism in the UK needs to also account for racism against Jewish people, Traveller communities, and...