My guess is that – from the inside – this behaviour is rationalised on the lines that doing-what-it-takes to retain power, fame and fortune is fine and necessary – so long as they 'use' that fame and fortune to harangue everybody else to do exactly the opposite.
This is 'long-term altruism' in action; and, within its selective framework, it is indeed perfectly rational. Because ‘my’ personal sacrifice would make 'no significant difference'; and is dwarfed by the ‘general-good’ I might/ hope-to do by Not making that personal sacrifice and holding-onto power…
Which is why it has been the modus operandi of the Left leadership ever since Leftism was originated: Leftism has always been led by the upper classes, and since the emergence of large-scale, organised Leftism, these upper class folk have nearly always stuck like glue to their privilege, and craved all the trappings of elite status.
So that by now, almost every single individual in the British Establishment (at the most expensive schools, the most aristocratic Oxford and Cambridge colleges; those holding the highest status positions in all social institutions, nearly-everybody with Honours and awards are united in spouting radical, socialist class warrior, feminist, antiracist, sexual-revolution propaganda 24/7.
This is a requirement of their holding leadership positions, but more fundamentally it is part of the deal they make with themselves; a deal that enables them to feel morally superior while behaving in a short-termist, selfish, and hedonistic fashion.
Leftist propaganda pays-for elite privilege.