I hope that everyone keeps an open mind, as these things aren't as simple when companies start to monopolize markets.
A CEO who takes this position and does an excellent job, will be doing so by reducing as many costs as possible, to increase their profit. It is true that a company can deny claims to sick or dying people, exploiting paperwork and processes that delay approvals, as long as they are following the law. You can argue that ethically, the CEO should ensure that as many claims are denied as possible, as the law allows this, and it is just their job to represent the company's financial interests.
It is the people's job to change these practices by passing laws that restrict companies' ability to do things like this. But when rich individuals and companies gain more control of the government, that becomes more difficult. I think the CEO does hold some blame for the harm caused to Americans, but any person who holds that position is beholden to the will of the company.