Part 9/16:

A critical point of contention lies in the nature of evidence. Experts like Dolan and Zabel agree that while direct proof—such as definitive photographs or physical debris—remains elusive, the collective credibility of high-level insiders constitutes a form of persuasive evidence. The film explicitly addresses the difficulty of obtaining documents, emphasizing that classified information remains tightly held, and that much of what is known is based on secondhand reports and personal authority.