Modern Leftist elites are instead primarily self-destroying - only secondarily (and contingently) self-interested - even when 'self' is considered in a extended fashion as including genetics, ideology or both...
Think about it - unlike any other elites, modern Leftist elites are neither patriotic/ nationalist, nor are they religious - so they strategically destroy the basis of their own power, they destroy the basis of their own prosperity, and they officially hate reproduction - even if they do have children take no mind to the long term health and happiness (let alone salvation) of these children.
They hate themselves - and have created a vast propaganda apparatus (in education, public administration, law and of course the mass media) against people of their own type.
Indeed the characteristic of modern Leftist ideology is that they regard their own spontaneous self-interest as something which must be confessed and overcome - and submitted to the self-interest of other specific groups. The outcome is a chronically-tormented state - but for a few PC Saints there is a kind of blissful ecstasy in witnessing and abetting one's own destruction and the destruction of everything one values; a PC martyr's last living memory being his own murder precisely by those whose interests he most assiduously promoted.
Of course, if you are already assuming that elite behaviour must be explicable in terms of self interest, then you can indirectly, and by looking behind the obvious, find or invent ways in which modern elite behaviour is self-interested.
But that was never necessary in the past: past elites were self-loving, self-confident, self-glorifying - openly, obviously, primarily.
No - modern Leftist elites really are essentially what they seem - that is, they are ashamed and want to destroy themselves along with everything else.
A very advanced, pure and refined form of nihilism.