I think that the the evolutionary argument strengthens my point. The positive emotions that someone feels could be a chemical adaptation devised by certain gene

I think that the the evolutionary argument strengthens my point. The positive emotions that someone feels could be a chemical adaptation devised by certain genes precisely to help the survival of similar genes across specimen boundaries. So genes trick the individual into helping another individual who shares certain specific genes (genes related to altruism itself). Narcissism could be a predatory evolutionary strategy which works by fooling altruistic genes within other specimens into thinking that they're the same. That would explain why narcissists are often described as 'charming' - It's all about giving an facade of altruism without incurring any costs for the specimen. Even the most altruistic people don't usually want to help convicted criminals.