The difficulty of talking about race, or even mentioning it as Cumberbatch did, points to a deep procedural problem which all public discourse is struggling to find a way to speak to. Hitherto any politician, writer or other public figure could proceed fairly well along one pre-agreed line. That line was that you should attempt to speak, write and even think aloud in a manner which no reasonable person could reasonably misinterpret. If somebody did unreasonably misinterpret your words then it reflected badly on them.

