The desire for 'equality' is natural to humans but that don't make it good.
Natural in the sense that children (for instance) will spontaneously plead for 'equality' and will (loudly, repeatedly) assert the injustice of inequality.
A five year old boy claims it is not fair that he must go to bed at seven when his nine year old brother goes to bed at eight.
The five-year-old claims equality with the nine-year-old on this particular matter, insofar as it gets him (more of) what he wants.
The context makes clear that the demand for equality is evil - because dishonest (at least: it misrepresents reality and subverts good order).
But why does the demand for equality have any rhetorical force?
That too must be natural.
Well, equality reduces to 'same'; and a genuine claim of equality is a claim of sameness.
But sameness is indivisible.
Sameness is sameness.
What is irrational, incoherent, evil - Leftist - is to divide identity and demand sameness in specified areas (where more is wanted) and not in others.
And to claim sameness where there is difference is an evil; just as it is to claim difference where there is sameness.
Thus all claims of equality which stop short of sameness are evil (including such sacred cows as 'equality before the law' - which has not ever been and cannot ever be and should not ever be true).
NOTE: I am, of course, talking about human beings. In physics things are different - in physics sameness is divisible. I wonder to what extent the error of dividing sameness/ equality into specific domains came from a false application of what works in physics?