It is rooted in past traumas or disturbances in childhood, adolescence or teen years within the family. Specifically in the parent-child relationship. Some believe that Narcissistic Personality Disorder occurs before a child is 3 which is why it so difficult to "cure" it. Those suffering from it always react like children emotionally because it was at that level maturation stopped and never was able to recover. So it could be when adults react like children it is because they keep seeking parental approval from everyone everywhere all the time and when they don't receive it they react very badly. Maybe the donjohn never got the approval he needed from his parents. I don't know what that dynamic was. But at 71 he reacts with childish immature and stunted emotional growth which prompts him to say/do things that even a child wouldn't do/say. Our president. The emotional age of a hissy fitting tantrumy toddler? SIGH.
