Though I am not a sci-fi fan I REALLY THINK YOU SHOULD DO THIS BOOK.
The best way to convey the complex reality of the corruption of a system is by a story that they only expect to entertain--not instruct them. It takes too much energy to explain the need to become informed of , say, the WT rotten tree/rotten fruit. Stories/parables come in sideways and invite deeper consideration of a matter for people that do not even want to listen.
To use a familiar example--the bible's story of a wealthy man taking his neighbor's only pet lamb to butcher for his own feast allowed David to freely examine the crime he had committed against another man--stealing a soldier's wife and having sex with her--(and killing the man) as though he did not have many, many wives "at his disposal".
Fiction often tells the truth in a more consumable form.