Other than the psychopath angle, there's also those who are mentally ill and/or delusional and believe they're terrible people when they're not far off average, maybe even better.
Likewise, perfectionists, but maybe I'm repeating myself.
Got to hope that you're not right for their sake.
Personally, I'm hoping for oblivion. Like it was for the billions of years before I was conceived, I assume, not that it's possible to remember that.