I kind of disagree. By the very definition of a psychopath you do have to be at least a little "bad".
Firstly when you consider that psychopathy falls within Anti-social Personality Disorder so most psychopaths have a criminal record.
Secondly, when you consider the Psychopathy Checklist items such as pathological lying, parasitic lifestyle, and lack of remorse/ guilt etc.
It's not glamorous, at least they are complete pains in the arses, at worst they are highly dangerous.