Final answer:
The sin that Msimangu points out in Kumalo's life is not explicitly mentioned in the quotes, but they suggest themes of societal oppression and the personal despair that poverty can cause, which could lead to contemplation of wicked deeds.
Step-by-step explanation:
In the novel Cry, the Beloved Country, the sin that Msimangu points out in Kumalo's life is not specified explicitly in the quotes provided. However, these excerpts touch upon themes of guilt, moral responsibility, and the impact of poverty on people's lives. The text suggests a broader societal sin of oppression and the ongoing wrongs towards a race, hinting at societal guilt rather than an individual sin by Kumalo. It also addresses the spiritual destitution and the contemplation of wicked deeds as a result of poverty and despair. While Kumalo's personal sin is not identified in the given quotes, it seems the novel delves deep into the idea that systemic issues can push individuals towards thoughts or actions they would not contemplate otherwise.