Do you know any pathological liars? They believe their own lies and are very convincing.
in My studies they were “sociopathic” liars. They are psychotic at the low end because, as you say, they believe their fantasies. They also have no conscience or remorse . It is absolutely incurable and many go to prison for fraud. This disease is not a defense but may mitigate at sentencing but usually not. In the Video that Trump put out today ,if you watch Carson ,he seems to smile when talking about the attack on a man with his knife. My analysis is that he also suffers fro Schadenfreude symptoms ( joy in seeing others suffer) but just a guess at to why it would be funny to stab another in their “abdomen”. That person has never been found. I would sure remember that. Wouldn’t you?