Because it's ludicrous.
Saying it's ludicrous is not an argument. People having psychotic episodes do ludicrous things, like sometimes murdering people because they falsely perceive them as a threat. Being convinced you are going to win a Nobel prize is ludicrous but that's exactly what my cousin believed.
Ludicrousness or lack of logic, manifest to us, may be an unshakable delusion to a psychotic. Hallucinations are common. Objects may be perceived as larger or smaller than reality.
This is a quote from a medical journal:
'deficits of object-perception and spatial attention shifting are not only associated with schizophrenia, but are common to all psychosis patients. Schizophrenia patients only differed by having abnormally slow right-to-left visual field reorienting. Deficits of object-perception and spatial attention shifting are already present after recent onset of psychosis.'
