Your example actually tells something. Nobody would believe your JFK baby eating story. It is easy to write a fake story, but it is not easy to have lots of people believe your fake story. "Misinformation" can spread because they seem plausible to enough people, not because they are "bullshit" like your example.
> "Misinformation" can spread because they seem plausible to enough people
Conspiracy theories are only believed by those who already mistrust the target. If there's a lot of conspiracies revolving around something/someone, you have a trust problem.
Perhaps a better example:
Jewish people are telling you the earth is round so that way they can distract you from the fact they're kidnapping children and drinking their blood.
