Jean-Jaques Rousseau makes the valuable distinction between natural inequality and lawfull inequality. The difference consist in the fact that there are differences in body between man, but giving one more "rights" than another is something else entirely. That is why he reasosn that everybody must have the same influence in selecting the person(s) who will be managing the group (the souvereign).
I've read Rousseau and as much as I admire his writings on primitive man or that of biological nature his ideas about government I find to be unrealistic.
And while I understand the articulations where he described natural inequality in contrast to societal inequality nonetheless it points out that people's nature is so selfish and extreme that when they are not devouring other species they devour their own without mercy.
That is why he reasosn that everybody must have the same influence in selecting the person(s) who will be managing the group (the souvereign).
Such a so called noble ideal has been a failed expiriment for thousands of years now.
Many people like to describe equality on the grounds that equal opportunity exists.
To that I would only ask them to prove that equal opportunity exists.