The left does support a hereditary ruling class, just like Europe. Union contracts for some American dock workers, and Mexican teachers, for example, allow children of union workers to inherit the position of their parents.
They support elitism, but they make no pretense of basing in on any “divine” right,
just on their humanistic, evolution-based assumption of superiority.
It’s easy to see, as well, that all this “environmentalism” and dietary studies are nothing more than well-veiled attempts to keep the “commoners” from using up the resources the elite see as rightfully theirs.