Just guessing, The authorities will prosecute you if you want to find out the motive in the book. The majority will treat you like an outcast if you want to find out the moral in the book. The majority will shoot you if you want to find out the plot.
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I interpret it as
"This is a story describing Life.
It is not meant to advocate anything, it is not meant to teach you anything, it may not always make sense.
It is only meant to describe novel situations a person may encounter in Life."
This is a great question for discussion!
This article helps put it in perspective. Maybe it was a humorous way to protect himself?
Article:
'Huckleberry Finn' and the Subject of Slavery
https://www.thoughtco.com/mark-twain-about-slavery-in-huckfinn-740149
Twain wrote this hyperbolic statement to actually imply the opposite-- that there is meaning and intent behind the novel. It's meant to be over-the-top and extreme, such a protest and extreme statement that it cannot be taken seriously.
Further humor, or irony, is that G. G. was probably a nod to George Griffin, a freed slave who became Twain's butler for over 17 years and family frie