That said, the idea that certain behaviors can be beneficial/productive isn't a bad one. I'm not sure if the suggestion that whoever was speaking (a prison inmate, I believe) was an expert in anything persay, the author is interpreting his response. The point is that psychopaths don't really experience much fear, even in the face of serious danger.
FWIW I'd tend to think that fear is generally the same regardless of the circumstance. Physical/emotional danger is, as far as the brain is concerned, pretty similar. And while I think nothing replaces experience, mere suffering doesn't make one an expert in anything either. Has to be processed.