The film is a direct window into John's life, illustrating that his involuntary outbursts, including racial slurs, are the signs of Tourette syndrome, not a reflection of his intent or character. The brain "picks" the most offensive word specifically because it is forbidden; it is a medical malfunction, not a hidden belief.
As Marcus Ryder stated:
"One day we may eradicate racism. One day medical science may cure conditions like Tourette's."
Until then, we must lead with education. "I Swear" is not just a biopic; it is a plea for understanding mental ill health and the reality of living with a condition that is often cruelly misinterpreted.