Or more precisely, it is that we allow a group of people, under the control of a single person or very small number of people, amass incredible power, and do so in an amoral framework in blind service to a goal of stock price growth.
The problem is a scale problem in my mind. If you limit the scale then all the other problems become manageable.
We wouldn’t need antitrust laws anymore if our tax laws made it unprofitable to own shares in a company with, for example, 50% of search market share or online retailing share.