True enough, but as a general principle the trouble with pissing all over people on the way up is that folk can be apt to meet them on the way down again ...
This used to be true because everybody was agreed on basically a monotheistic paradigm of reward, punishment, redemption, forgiveness, self-correction. Unfortunately, in a global world, especially one where you are developing an online presence which is hard to check against your real character, people do get away with it if they move around a lot and constantly reinvent themselves, cutting ties as they go along.
That said, it is always easiest for the narcissist to thrive in their natural habitat especially if it also happens to be the place where their honed their skills in the beginning. They always tend to gravitate back towards showbizzy places where their personality flaws will be perceived as normalized behaviors.