It's crucial in this age and society to know about and innerstand "Diabolical Narcissism" so one can recognize it when it enters their life and even attacked personally. Those who are aware of DN have far better odds of surviving it and not becoming diabolical narcissists themselves.
In this attached video, Ann Barnhardt diligently lays out the construct on the psychology of DN in such a way that one may become immune to what is rampant in today's world-- degrading the Soul.
A keynote from the video:
The psychological community really has no interest in engaging "Diabolical Narcissism" because when they go to therapy they quote: "DN's never make any progress--many of them lie--DN's don't believe that anything is wrong with them--DN's have no desire to change" (the psychological academic community has no desire in researching this at all)