There was no politically correct story in 1960.
Amen
From Harper Lee's own words, "She tells Caufield that Esquire has turned down an article she submitted (Go Set a Watchman) because, she says, the editor did not believe that there were segregationists who also despised the Ku Klux Klan. “This is an axiomatic impossibility, according to Esquire!” she writes. “I wanted to say that according to those lights, nine-tenths of the South is an axiomatic impossibility.” http://www.newyorker.com/magazine/2015/06/08/yours-truly
Then, she wrote "To Kill a Mockingbird", and it was accepted for publication by HarperCollins.
Her editor rejected the original manuscript, but suggested a “prequel” as seen from Scout’s eyes when she was a little girl. The reaction to Harper Lee’s newly published book says more about the infantilization of American culture and intellect than about Atticus Finch.