Why do critics argue that Mark Twain ruins "The Adventures of Huckleberry...

[Liberty245]

...Finn" by bringing Tom Sawyer back? Why do critics argue that Mark Twain ruins "The Adventures of Huckleberry Finn" by bringing Tom Sawyer back to "help" Huck free Jim?

I dont understand why its a big deal

 

[flor34]

I don't understand why someone would argue one of the greatest authors of all time ruins his OWN novel.