The issue with capitalism as with every other pure system of managing our worldly affairs, is simply that we have human beings running these affairs, not incorruptible angels. Were corruption impossible, then any system will function, though some better than others.
The corruption of capitalism does have this advantage, it's obvious and utterly ugly. The ultimate goal of a real world capitalist is to gain the advantage of a monopoly by obtaining government backing for such a monopoly, unrestricted and for all time. In earlier times this was done by direct decree of the Pope or the King, now it's done by decree of Congress or the judicial branch by extending the rights of patent or copyright or assigning the rights of patent to something that does not meet the standard or removing rights of patent from something that does meet the standard. The former two are so well known as to need no mention to any inhabitant of the internet in these days of the RIAA and nearly unlimited copyright spans, the latter two are not as well known, but I could mention both Adderall (simple remixture of a well known drug for time release) and the weed eater (patent granted but later overturned as "obvious") as gross examples of the latter. There is also outright theft of patentable ideas or patents, as the inventor of the time delay windshield wiper or the inventor of the push button - pop off socket wrench would testify, and did testify, in court. There is also direct theft of property from private citizens under the aegis of eminent domain, as in the constant and unending condemnation of land for private enterprise, such as ball parks or industrial parks.
In short, a major goal of a successful capitalist is to capture the government as a servant. This is not a necessary goal, but it's evident in every capitalist society in history, so evident that it becomes a major feature of such societies.
Just as Marx glossed over the obvious problems of governance under a system of bureaucracy that controls production, so does Mises gloss over the obvious problems of how one controls wealth in such a manner that it does not attempt to capture the government. Railing at government "interference" is not productive when the bulk of that interference is done at the behest of the capitalists involved. Simply adding up the bills for the USA since 1970 in government "rescues" of financial institutions and major industrial plant and gifts to same, most of the latter unknown to the public, shows this clearly to be one of the largest items of public expenditure over that period, very likely the largest. These vast sums were not disbursed over the objections of the recipients.
Every social system ever developed is subject to exploitation and corruption. If you have a king or a feudal system, the road to easy profit is to control the king. If you have a religious system, you simply buy the Pope. If you have a socialist or communist system, you want to be the top bureaucrat. While many people are attracted to anarchistic systems such as Libertarianism for its lack of control, this quickly leads to total corruption and will degenerate into a feudal system, as the anarchy left behind the Roman Empire showed.
Control of this corruption and exploitation means every successful government must govern with an eye to the practical and prosecute corruption whenever found and in whatever office. Those that do not perform this task will eventually perish.