James Fallon is a neuroscientist who discovered late in his life that he had the brain scan of a psychopath. He had a very good childhood, a nurturing mother who noticed that he was "weird" but loved him anyway, is married, has 3 children, never got in trouble with the law.

Here's an article describing it's like to be (his version of) a psychopath in his own words:

The devil you know: inside the world of a psychopathic scientist | The Verge