Final answer:
Capote includes Dr. Jones's report in the book to offer deeper insight into the murderer's mental state, prompting readers to question the legal system's approach to intellectual capacity and criminal culpability.
Step-by-step explanation:
Truman Capote includes Dr. Jones's report in the book "In Cold Blood" to provide a more comprehensive insight into the mental state of the murderer, even though it wasn't deemed admissible in court. By doing so, Capote raises critical questions about the complexity of human behavior and the legal system's handling of such issues. The inclusion challenges readers to consider the extent to which intellectual capacity should influence criminal culpability. Capote's choice to include this information reflects his thorough approach to the narrative nonfiction genre, providing a deeper understanding of the case beyond the legal proceedings.