You can't just blame it all on the sickness. He's apparently an extreme racist, crazy or not. The way you put it sounds like he doesn't even exist and is all just the sickness.
https://www.amazon.com/Angelhead-Brothers-Descent-into-Madne...
Would you accuse a person with tourette's syndrome of racism due to their outbursts? This disease is far more pervasive and systemic than that.
Vincent van Gogh was similarly mentally ill as a society we look past the things he could not control and instead focus on what he has created. I suggest the same course of action here as I believe the situations are uncannily similar. This is all I will say on the matter.