All humans have tendencies of narcissism. It stems from childhood. Because in a baby’s world, there are little to no limits. It is free world. A world of achieving. But as the baby grows, it’s freedoms to mess around start get curtailed by parents and other adults. However, the human brain in a way keeps the memories of that freedom. So all grown humans are in way trying to regain that kind freedom based on the mental programming they got from their life circumstances. It is some kind of memory. Some people have learnt to not care who gets hurt just as long as they regain it. Others hold back from aggressively seeking it just so they don’t get perceived as bad people. Both behaviors qualify to be categorized as narcissism.