This isn't really Kafka for Kwanzaa. It's just Kafka ... a good animated 21-minute interpretation of the short story A Country Doctor by Koji Yamamura (and, well, it's Kwanzaa, and I like the way "Kafka for Kwanzaa" sounds).
I'll never presume to know what motivated Franz Kafka to write any of his great works, but if I were to imagine an answer, I'd guess that A Country Doctor was his attempt at capturing the slippery logic of an unsettling dream state in all its richness and moral complexity. There's plenty of guilt, self-hatred, rage and sexual jealousy to go around, and it's damn cold out, and the kid isn't really even sick ... or is he? Well, there it is ... Happy Kwanzaa, and Happy Kafka.
More information about this animated movie can be found at Open Culture.