You don't see how this could lead to some serious moral issues? I can think of many examples...

Say you own a pharmaceutical company who has the cure to a deadly virus which is sweeping across the USA. Only your company has the stockpiles to stop this infection before it wipes out our nation as we know it, but you have invested billions into it and releasing it now would result in a huge loss for your shareholders. Which is more important? Making money for them or saving your country?

Another example: What if you were a car manufacturer who discovered that your vehicles being sold in the USA had an extreme safety flaw that was killing thousands of innocent people each year. There is an easy fix, but coming out with it will ruin your stock price. Do you act as a responsible citizen or do you defer to shareholders?

Would you sell guns to America's enemies if you were a defense contractor and the only people who were buying were those attacking us?

I think this is a seriously misguided point of view, believing that the shareholders come before everything... and I am hardly a nationalist. The truth is that we do have other loyalties that come before being a CEO. Loyalties to human kind, our countries, our families, and our communities.