People are not born without rights, it takes a society or group to take them away. Who do you think opresses women and those in minority groups? Societies didn't evolve to be enlightened, they evolved into discriminatory systems. Those systems get torn a little bit down, built back up, asymmetricaly across societies, constantly and probably forever.

Just gander across our current collection of societies and marvel at how diverse those systems are, even in high tech societies.