I think the flaw here is that often even the 1% of the 1% - the Sam Walton’s and Warren Buffett’s and Bill Gates and Jeff Bezos of the world seem to navigate these waters without exhibiting what I see as pathology.
As far as I know, they weren't born into massive wealth, even though their families were rich.
However, there are examples - for example the British Royal Family has produced some people with a massive sense of entitlement (Prince Charles having a valet to apply toothpaste to his toothbrushes, for example) but even they don't have Trump's utter lack of redeeming features.