My two cents, I believe there is an nuance worth deliniating, specifically differentiating between being elite "in status" vs being elite "in nature." Painting broad strokes here for the sake of this post (so take with a grain of salt)...
Many people born into or groomed for an elite status (via inherited wealth, rich families, strong support systems, etc) are rationally self preservationists. They were born on third base and know it. Many subconsciously know they do not belong there and cannot live up to the level of performance, intellectualism and hard work that laid the foundation for their current state or that others had to endure. Thus, they need support from the system to preserve their current state.
People who became elite in nature, are far more likely to value meritocracy. They lacked support, didnt know there was a "system" to be leveraged (eg getting unlimited time for an SAT score with a doctors note), had a chip on their shoulder, grinded their way to be top of their class, were the most productive, knocked on more doors, took risks others would consider irrational, etc.
At every level they've had to fight for what they have in a world where the criteria is often opaque. Being genuinely competent, they don't have an innate imposter syndrome, and thus, they value a system that has a clear and objective criteria for them and others, because they are confident they will operate fine within it.
EDIT 1: to add: With the above in mind, the more useful analysis in my opinion would be to assess the extent to which ethical frameworks and the role of fairness and meritocracy differ between those who were self-made (eg 1st of their generation to go to an IVY or get an MBA) vs not in "elite" positions of wealth or power.
EDIT 2: I'm not suggesting all people born rich don't deserve their success or do not possess these qualities of hard work, etc.