As for a narcissist, they can be caused by childhood trauma, yes, but based on what narcissism is, their consciousness is supposedly weaker than even that of a pshycopath. Pshycopaths lack emotions for both themselves and others. A pshycopath is someone who's born with a mental illness in which the person is unconscious of his own actions due to lacking amygdala and a decreased frontal cortex of around 20%, they behave like animals and are absent of every form of rationality. A narcissist or a pshycopath would never come to that conclusion, both for way different reasons. Rather, it's a metaphor on how much people with mental illness are outcasted by society and are given the fault for everything they do instead of trying to help them overcoming their problems through therapy or just giving them the attention they need. The character is represented as someone whom understands the world for what it truly is and can empathize with other's problems, the phrase 'I cry when angels deserve to die' is not to be taken literally. Some may actually even say he's a narcissist, but personally I don't think that's the case. First off, the main character is someone suffering of antisocial personality disorder(sociopathy), in which he blames his controlling dad for everything he became as an adult. Chop suey has a whole mix of meanings on their own, in which almost every verse implies something different that's happening to the protagonist.

Chop suey lyrics meaning breaking point