John Bennett Ramsey, the father of murdered six‑year‑old JonBenét Ramsey, whose homicide case remains unsolved, issued blunt advice to the family of Nancy Guthrie on dealing with the police. The Ramsey patriarch shared his recommendation on Wednesday’s episode of “Brian Entin Investigates,” in which he advised the Guthries, including “Today” anchor Savannah Guthrie, to “really scrutinize” what investigators are doing. “Don’t assume the police ar…