People would still differ genetically. Right now we skirt that issue by saying that we can't control genetics, but we can control how society treats its people.

People would still differ genetically. Right now we skirt that issue by saying that we can't control genetics, but we can control how society treats its people. But presumably someday we will have the power to control genetics, and we'll repeat the same debate all over again. So long as there is inequality of outcome, there are probably always going to be people who assume unfairness---not just in people who lack a sense of agency and self-responsibility, but because I think humans generally have an instinctive dislike of inequality of any kind. This will continue until the end of time: if you believe in fate (whatever that means), some people are always going to have better fates than others (unless you want to give everyone the same life), and people will keep getting mad.