If a ludicrous idea started building momentum, the ringleader and their affiliates would get pushed out of an organization, then another one, and another one, before being deemed so poisonous that society in general would exile them to some tract of rural land to farm beets and / or start a cult. If they were still interested in spreading their ideas, their options were limited to the physical media they could afford to purchase — a monthly pamphlet sent through the mail, a ham radio, or a sign on the side of the road. Barricaded from the tightly controlled mass communication networks of print distribution and broadcast signals that informed the nation and the leaders they chose, they were forever stuck on the fringes.
That was where “crazy” used to die.
We also got wikipedia so maybe we can start shunning weirdos again and keep the good parts of the Internet.