Expectation & memory
Ask what else might be shaping the conclusion.
People often encounter an account after extensive searching, high hopes, or difficult prior experiences. Expectations can shape perceived benefit and meaning; the placebo effect overview from the National Library of Medicine describes how expectation and context can influence reported outcomes. This does not mean a person is pretending or that their experience is worthless.
Memory is reconstructive rather than a perfect recording. A person may sincerely remember the most intense or meaningful moments while the ordinary, uncertain, or difficult details recede. Confirmation bias can also make evidence that fits a hoped-for answer stand out; confirmation bias is a useful concept for examining that tendency without assigning bad faith.
Selection matters too. Public accounts are more likely to feature people who want to speak, who can make sense of an experience, or whose story is useful to a particular audience. People with ambiguous, negative, or harmful outcomes may be less visible. That is especially important when viewing narratives connected to athletic recovery stories around ibogaine or other identity-centered communities.