How does having a main character like Van der Vyver support the author's purpose for writing the story?
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She hopes that anti-Apartheid readers will see how bad inter-racial relationships are and start to support Apartheid
She hopes pro-Apartheid readers will feel sympathy for Van der Vyver and start to question how Apartheid laws can also be bad for white people
She hopes that all of her readers will just enjoy an interesting story and be entertained by the twist at the end