Changing the past to suit the moral conventions of today is wrong on so many counts – if we change it, we are in danger of returning to it.
Removing the word in question is dangerous – we need to be constantly reminded that the fight for racial equality and acceptance in the USA, the world’s supposed ‘civilised and democratic’ superpower, has only been (partially) won over the last couple of generations.
Context is everything – surely it’s useful for kids growing up today to see things how they actually were, not as we wish that they had been?
However, how is a teacher supposed to teach it as a great work of historical fiction to a class of different races AND deal with the rights and wrongs of the word “****” being used.
Explain the context & ask questions:
Did Twain use the word himself in his own life?
Was the word used by everyone in society regardless of intention?
What other words were used to describe people of different races and why? When did the word become pejorative?
Was Twain aware that the word was offensive and placed it in the mouth of his hero purely to show that even those with good intentions can cause unintended offence?
All these things could be discussed to give context to the book.
If we don’t talk about these things, they fester.
Pretending they never existed is even worse.