I think there are some misunderstandings in this article and in general when people talk about this subject.

First off, Capitalism is the use of capital as a tool of productivity... that tends to create more capital. It's called investment and must be practiced by all economic systems.

What you are calling capitalism is ownership. It is an organizational system like primogeniture. It is simply a convenience to produce order like other laws do. It is far from the natural law that many people think it is ... going back to John Locke. To make it short, ownership is fine and allows great creativity from certain individuals but you must not allow transfers of estates because then the wealth will almost inevitably dissipate by the third generation. It is more likely to endanger the descendants than help them. Allow generous inheritances, but not transfers of fortunes. It helps no one and destroys what was created.

As a final point, ownership or capitalism isn't the problem. The problem is the Darwinian driven pursuit of power, driven by dominance behavior. Like other Darwinian behaviors, there is no off switch so the person can never be satisfied with the wealth or power they have. They will feel they need more. They will also work to weaken other powers including laws of society and civilization which is where power is supposed reside after it has been wrested from kings.

Consider greed. You have had to wonder how much is enough. No amount is enough if the greed is driven by a Darwinian instinct for the power that the wealth gives.

As a final minor point, I'm currently working on a description of power and the problems it brings. Wealth is a form of power so it applies to that. The thing is, humans have had to deal with this for a long time. In ways the problem peaked with the Romans. There are old philosophies developed for dealing with this problem that are much better than what is commonly suggested today. They are very well known. They must though be remembered and understood.