Besides being a bit of a shallow comment, what exactly do you imply here? That capitalism logically implies that the rich become richer? I don't think this is necessarily the case, it just needs a stronger government than what the US currently has in place. (e.g. progressive taxation and strong antitrust policy seem to work fairly well in Europe).
But with how compounding works, isn't this outcome inevitable in capitalism? If the strong government prevents it then the first step for the rich is to weaken or co-opt the government, and exactly this has been happening.