>>13988821people with mental illnesses are uniformly unintelligent. "mental illness" and "brain damage" are synonymous terms. down syndrome is a mental illness, so is microcephaly. if "mental illness" wasn't an indicator of mental disfunction or lack of function then it wouldn't be referred to as an "illness". athletes don't get injuries or illnesses that make them stronger or faster, the same is true for mental performers.
mentally ill = low IQ
there are no exceptions to this rule, however there are a vast number of brain damaged, deluded, low IQ mental patients who will irrationally insist that being brain damaged somehow makes them smarter. that irrationality is evidence of mental disfunction.