I was pointing out the circular logic in these explanations. Saying someone is rich because their parents were rich (ad-infinitum) is like saying someone is lucky because they are lucky. It is not a useful explanation because you can't use this to do anything. In fact if you use this explanation to decide public policy, like say socialism, then the converse is also true, you make everybody poor, then their descendants will be poor. But obviously in our history on average, we've all been getting richer in the long run.