inability to connect with reality, experiencing rage attacks and emotional breakdowns when that reality catches up, is one of the symptoms of NPD:
"Narcissists operate from an image they hold of themselves in their mind. They do not operate from the reality of feelings in their body. This does not mean they do not feel. It means their feelings are generated by what they believe about themselves and others in their head. They do not “test” these beliefs through “real” interactions with people. Because they froze the ability to feel at a young age, they never have the opportunity to correct the picture they hold of themselves in their mind.
When the narcissist is confronted with a reality of who they are and that differs from their mental picture, they discount the information. If the information persists or gets stronger they will rage at the information or the informer."
and that's what happened with elliot - his image of himself as god-like and divine was in constant clash with the reality that surrounded him, which included rejection as part of typical interaction with his peers and family, and this made him very bitter and angry until the day that he reached a breaking point
this is from his manifesto:
"I am Elliot Rodger… Magnificent, glorious, supreme, eminent… Divine! I am the closest thing there is to a living god. Humanity is a disgusting, depraved, and evil species. It is my purpose to punish them all."
in his manifesto he actually did propose creation of a new government with himself as the supreme ruler, in charge of every aspect of society, including a "fanatically loyal" army and concentration camps - it doesn't get any more ego stroking than this:
"In order carry this out, there must exist a new and powerful type of government, under the control of one divine ruler, such as myself. The ruler that establishes this new order would have complete control over every aspect of society, in order to direct it towards a good and pure place. At the disposal of this government, there needs to be a highly trained army of fanatically loyal troops, in order to enforce such revolutionary laws."



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