Spot the Problems

For all I know, this story is true, but if it is, this woman went about spilling the beans in the worst possible way. More intriguing than her claim that her father is the Zodiac killer is the fact that there are dozens of people who claim to know his identity, and even that they are related to him. Unless they are an unusually forgetful or dimwitted crew (who don't realize or remember their connections to one another), they can't ALL be the Number One Witness for the Prosecution. So what drives people to claim "knowledge" about the Zodiac killer with a certainty that warrants trying to shout down another crazy person during her press conference? Words escape me.