Tell me what the main message of the film of 12 years a slave if it was portrayedby the director

The main message of the film of “12 Years a Slave” is the cruelty of slavery as an institution. The director Steve Mc Queen´s portrayal  of  mistreatment forces audiences to confront it in long uninterrupted scenes that force us to feel the full impact of human cruelty. Rather than explaining things overtly through dialogue, the characters’ behavior tell us of the  the subservience to survive slaves had to endure.

explanation:

allergens: overstimulate the nerve system

neurotics: attack nerve cells

mutagens: damage or otherwise alter dna sequence

generators: cause defects during growth and development  

carcinogens: cause unchecked cell growth

i hope you get the idea according to me these are the effects that happened.