After months of speculation, HBO has announced part of the cast of the latest round of Harry Potter IP-mining: the new TV adaptation of the original books will feature John Lithgow as Dumbledore, Nick Frost as Hagrid – and Paapa Essiedu as Snape. As the Mail and Telegraph’s headlines were quick to inform their readers, yes, this means a “Black actor” in that iconic role. There is a real concern that Essiedu is drinking from a poisoned chalice – that he will be associated with an author who is at the forefront of a gender-critical movement that has succeeded in...