The existence of different types of people is explainable in aggregate.
Suppose @elonmusk were a fraud or is deluded with grandeur (imo, far from it!!), he's still enormously useful to civilization in that he inspires.
Similarly, we cannot survive without bean counters!
As Elon said, maybe he's a narcissist. That may not be ideal if you're his wife or assistant, but his supposed narcissism does amazing things for society! We've evolved to be neurologically diverse. It enhances our chance of survival.