What is the author's purpose in writing Kaffir Boy?

In my opinion, Mark Mathabene's main purpose in writing
this book was to highlight the ways in which apartheid was an evil and inhumane
system.

When you think about this book, you should remember
that it was published in the United States in 1986.  At that point, the issue of
apartheid was just starting to be relevant to many Americans.  We did not know a whole
lot about how apartheid affected the lives of black South Africans like Mathabene and
his family.

I believe that Mathabene wrote the book in
hopes of educating Westerners and in hopes of getting them to pressure the South African
government to end apartheid.