Unregistered trials and publication bias enable critics to ignore good science, and what interests the scientist does not necessarily reflect the interests of policy makers. In the contest between science and hope, science does not win. Science deals with the rational, practice deals with frightened patients. Hope needs more than what is rational. Not all relevant evidence is scientific.
Scientists most recognize other kinds of evidence.
Interests trump evidence. Health interventions always increase someone's income. Any advice to reduce service is likely to be ignored. Science isolates and health connects. Methodological rigor favours the particular.