

If you’re going to vilify an entire group of people, do so based on their actual behaviours and not on the personality trait(s) that they share.
We are villifying them based on their actual behaviors. It just so happens that when you look at the reasons for those behaviors, you see that it is caused by a personality type/disorder, and as such, naming the group that behaves badly in this way also essentially names the personality type/disorder. You simply cannot separate the two concepts, because they are causally/definitionally linked. As such, it is paradoxical to simultaneously condone discriminating against the behaviors and condemn discriminating against the personality type.
When I am talking about narcissism, I am talking about something much broader than NPD. The ICD 11 revised the whole section on personality disorders so that they are no longer separated into clusters (A, B, and C) and are now characterized on a per-individual basis by a combination of atomized descriptors. One of the major reasons for doing this was because there is a lot more overlap between them than the categorization of discrete disorders implied. The lack of empathy that characterizes narcissism was present in basically all of cluster B and frequently occurred with several disorders in clusters A and C.
Narcissism is way more common than you think. I estimate that they make up at least 1/3 of the population, and probably more like 1/2 (and exactly how I’ve arrived at these numbers is something I’d want to write about). Those “regular” people who are “pushed” into egotistic behavior? They’re actually low-grade or covert narcs who are being given permission to be narcissistic by our culture.
The capitalist system does work as intended, but the reason that it is intended to work the way that it does is because it was designed by narcissists from the very beginning (another topic we’d be discussing, with sources), and it serves them very well. They weren’t a hidden cabal, though, and the emergence of modern capitalism didn’t happen overnight. The system gradually emerged piece by piece as various people tried to solve various problems (and it probably all started with the issue of distributing portions of tribute to one’s lackeys).