Like the statues argument.

The statue may be anachronistic. However - does that mean that the person and the reasons for erecting that statue were without honour or just cause?

And the same with language.

Oliver cromwell did all kinds of damage , vandalised all sorts of beautiful artefacts - even the crown of England. Churchill's wife ripped up the Graham Sutherland 's painting of the old man. Sutherland was a much greater artist than her old man.

We destroyed all the Nazi works of art we could lay our hands on after the war. But did we miss a truth hidden somewhere?

When we say - your mode of expression is so unutterably vile that we must stall the conversation. I think its a sort of defeat for us all.