The argument is that the shareholders who own the majority of a company's stock (by value, not voting rights) should be able to control the company, not a minority owner. It is the corporate structure that allows guaranteed minority control (e.g. Zuckerberg owns something like 13% of Meta, but controls 60% of the voting power). In a free market, why should publicly traded companies be allowed to sell "shares" that are not ownership in the traditional sense?