There are plenty of successful entrepreneurs that are perfectly capable of relating to others and treating their fellow men, friends and family with dignity and respect.
Some people succeed because they're playing nice with others, some succeed in spite of not being able to do so, some even succeed because they are are assholes.
There is no correlation here and you probably won't be able to extract many lessons from this piece, no one talks about it because it isn't a particularly common experience.
Wealth does not typically turn assholes in to non-assholes.