To argue that a company's only duty is to its shareholders does open one up to the argument that nobody but the shareholders (and maybe the employees) owes any

To argue that a company's only duty is to its shareholders does open one up to the argument that nobody but the shareholders (and maybe the employees) owes any duty to companies (e.g. respecting their property). Why should anyone pay for their products or services in such a worldview? You have to be a special kind of stupid to feel more sympathy for big cooperations than disadvantaged pupils and their parents.