Yeah, but this is different. This isn't medicine or physics or astronomy.
This is history, a different field.
Kennedy was having sex with a tramp who was also the mistress of the largest mob boss in Chicago. She served as a messenger between Kennedy and the mob boss, who was Capone's successor. She was agitating the Mob to attack Castro, as revenge for the Mafia losing their casinos in Cuba.
People assumed this was a crazy conspiracy theory, too, cause it seemed too fantastical to believe. Well, guess what. It was apparently true. The slut even produced Kennedy's numbers at the White House, IIRC. Just cause it seemed extraordinary doesn't mean it wasn't real.