I completely agree with your definitions @builderofcastles. My wife and I have studied psychology at a tertiary level and this is consistent with the theory.

Once I had studied the condition of psychopathy I began to understand some people - mainly in the corporate world - who had damaged me in the past. Particularly notable is the trait where you never know which "identity" you'll be met with on any particular day. A psychopath may befriend you to lure you in or reveal vulnerabilities and the next day exploit your emotional investment by revealing your weakness or whatever is required to benefit themselves. Often they are successful in business as they can influence dispassionately. Very harmful characters and hard to combat as they operate under a veil of normalcy.