peaceout: "however, personality disorder and mental illness are not generally regarded to be synonymous
ergo 'psychopathy is not a mental illness'"
But in that case, there should be no problem with psychologists or psychiatrists diagnosing either psychopathy or narcissistic personality disorder, should there? Because according to you, they're not mental illnesses.
To quote from the Allen Frances letter to the New York Times:
"I wrote the criteria that define this disorder, and Mr. Trump doesn’t meet them. He may be a world-class narcissist, but this doesn’t make him mentally ill, because he does not suffer from the distress and impairment required to diagnose mental disorder."
Unlike you, Frances seems to regard the terms "mental disorder" and "mental illness" as synonymous.