How does the moral lessons of 'To Kill a Mockingbird' by Harper Lee endure today?

Harper Lee's 'To Kill A Mockingbird' is set in the Alabama town of Maycomb in 1936, 40 years after the Supreme Court's notorious declaration of white and black races being 'separate but equal'. The 'separate but equal' notion can be compared to two parallel lines that will never meet in unity. The novel is narrated by Scout Finch, in a Bildungsroman style. Scout Finch relays her observations of her family's struggle to deal with the class and racial prejudice shown towards the local African-American community. Atticus Finch, Scout's father and teacher, is presented by Scout as the beacon she needs to behave honourably in harmony with the 'negroes' of Alabama. This extract will show that the 1936 Alabama society is a reflection of what is occurring today in the US Congress.
Atticus Finch, the only white man who held the integrity of all of Maycomb, defended Tom Robinson, a humble black man, against a rape allegation. Atticus proved that Tom Robinson could not have hit the victim, Mayella Ewell, on the right side of the face because his left hand was mangled beyond repair. Atticus' contentious skills whilst cross-examining Mayella Ewell and her father probed the Finch's neighbour Miss Maudie to say: 'as I waited I thought. Atticus Finch won't win, he can't win, but he's the only man in these parts who can keep a jury out so long in a case like that'. Miss Maudie is referring to a harsh reality: when a white claimant is against a black defendant, the odds of the black defendant being exonerated is less likely than the white claimant being successful. According to the National Association for the Advancement of Coloured People (NAACP), African Americans are incarcerated at more than 5 times the rate of whites when African Americans only constitute 34% of the United States population. Very recently, lawmakers passed a resolution condemning President Donald Trump's racist tweets telling congresswomen of colour to 'go home' to their countries. Trump's vile, racist and ignorant tweets and treatment of those congresswomen are a contemporary reflection of the endemic racism and ignorance of the jury and court makeup in Tom Robinson's trial in 'To Kill A Mockingbird'. Tom and the congresswomen cannot win or gain a grain of justice as Tom's innocence did not gather a flux of racial unity in Alabama and Trump is still in office and claims 'I don't have a racist bone in my body!'