There is a problem with Sir Keir Starmer’s reported plan to expel 1,000 Labour members associated with ‘poisonous’ groups, and not just that there are way more than a thousand poisonous people in the Labour party. The problem – and it’s a common error – is that Sir Keir exaggerates the role played by the far-left in bringing Labour to the point where it has lost four general elections in a row and last led the Tories in a poll almost six months ago.