It's called delusion. It can be dangerous. Vide the "international Zionist conspiracy" flew remote controlled planed into the WTC nonsense hundreds of millions of Moslems "believe."
Kerry believes he was in Cambodia, and that Nixon was in the White House then, too. He repeated the story 50 times.
Sick stuff. At best it is funny. At worst it is genocidally dangerous.
I guess they need to just tell each other whatever it takes to get them through the day.