How is the writing style of the immortal life of henrietta lacks effective?

Author Skloot captures the beliefs and the manner of speech used by the Lacks family. The family was generally not well-educated and from the South. They imagined things about Henrietta and her cells They believed her cells were being used to clone other people. They also believed that Henrietta could be cloned from her own cells. They thought the doctors had injected Henrietta with cancer cells so they could use the cells. They felt that they, too, would contract the same form of cancer that Henrietta had. Rebecca’s treatment of the Lacks family is always respectful. There is not a note of sarcasm in the accounts of her discussions with them.