Or they do. This level of wealth inequality is a new phenomenon, and it is already showing how great it goes, with fascism and other fringe ideologies on the rise.
The chance that Trump or a similar idiot being elected and turning dictator is a possibility in the US is a direct consequence of these fuckwits gutting society itself. It is very well possible that these guys will either become sock puppets of a Trump-like figure, and keep some of their wealth in exchange for losing all of their power, or commit grisly murder-suicides of their whole family in droves like in Russia.
They either don’t see or don’t care that they are cutting down the branch that they (and everyone else) are sitting on.