What is even your point? If a non-black person walks up to a black person in America and calls them a “negro”, it is likely going to have the effect of any other slur. That’s the reasoning for the content warning. The fact that it wasn’t a slur at the time of its use in this leaflet is relevant for context, but in the context of our modern world, a lot of black people don’t want to be called a “negro”.

If OP changed the title from “the N-word” to “an N-word” would there be less pedants in this thread?