Fading memory suggests that the term "psychopath" got hurled around with such gleeful inaccuracy by those outside the psychology trade (presumably after the release of Hitchcock's Psycho*) that it got dropped as an official diagnosis. Terms such as "narcissism" (in full, "malignant narcissism") may be going down the same drain.

I suggest we all apply the Goldwater Rule, lest we dilute trade terms into uselessness.

* I may wish to rephrase that.