[Skybird]

No doubt he formed out a psychopathic personality.

When that process started in his life, can be discussed. That the diagnostic concept is not just a myth, but makes sense to stick with, to me is not open for discussion (as it is for quite some psychologists today).

Diagnostic categories in psychology follow vogues, and last but not least: political correctness, sometimes for good, sometimes for worse. They can change over time not necessarily always due to new scientific insight, but due to changing times: and then just reflecting changing social values, independent of how "valuable" these values may be or may be not. If you are the only seeing man living in the land of the blind, then you are the exception from what is defined as "normal".