Not a shocker that corruption ruins things. I guess then the question is how you can design a broadly distributed system that removes the incentives for corruption and minimizes its impact. My guess is that such a system won't be found in capitalism
Capitalism quite clearly requires strong regulation. At least, any sort of positive capitalism that doesn't immediately succumb to monopolies, cartels and corruption. The problem is that the loudest voices arguing for capitalism, also tend to argue against regulation, accountability, and that sort of thing.
Read "The Path to Power", LBJ biography. They describe this process plainly and how he continuously used his across his entire career in this way. Its very enlightening.