Final answer:
Mark Twain is expressing a social point about the destructive nature of feuds and the senselessness of violence in Huck Finn.
Step-by-step explanation:
In describing Buck's attack on Harney and the Grangerford/Sheperdson feud in Huck Finn, Mark Twain is expressing a social point about the destructive nature of feuds and the senselessness of violence. The feud between the two families is shown to be filled with pointless killing and hatred, highlighting the negative impacts of social divisions and conflicts. Twain criticizes the idea of feuds and violence, suggesting that they only bring suffering and death.