As long as parents do their best to help their own children, rags to riches will be a fairy tale. For poor and rich kids to grow up and do as well as each other, rich parents will have to treat their kids as badly as poor parents do, because the opposite is impossible.
That's a strange equivalence of prosperity and morality...
Poor people don't uniformly treat their children poorly. But startup founders profit from three advantages only rich people can provide: (1) the money for an Ivy League education, (2) the knowledge that there's some security to fall back on in case of failure, and (3) the knowledge how to make small talk, what to wear etc. when meeting investors and other stakeholders.
All these can be solved by policy: university scholarships for (1) and, through that, a bit of (3), plus (3) some form of social safety net that allows everyone to fail without fearing to starve.
