The problem is that capitalism can be seen as a system that optimises soley for obtaining money, a token exchangeable for goods, services and power. Once a threshold is reached, it can be gamed to maximise and entrench returns. However, money by itself is an abstract nothing. Humans needs - and societal needs - are utterly unrelated to this obsession and are not selected for. Many things require long term generational thinking that simplistic or purist ideologies do not encompass. It would be equally horrific to create a system that optimised soley for human happiness, for example, as everyone would end up drugged off their faces while the world around them crumbled. And no, under capitalism billionaire altruism does not solve this, their obsessions are nearly always lunatic, monomaniacal or destructive, even in the rare well-intentioned cases.