This argument hinges on the idea that the executive is earning rewards that are vastly disproportionate to the risks he faces for making mistakes.
Since the executive is compensated orders of magnitude more than any individual rank and file employee, it's easy to think that his reward is too large. However, on deeper examination you find that this isn't as clear as one might think it is.
Doesn't every employee enjoy the benefits of the company's success? Individually their pay is small compared to the executive's, but taken together their collective reward dwarfs what the executive takes home. When taken in the context of the entire company, the pay of the executive seems more reasonable.
As for risk, remember that however all-powerful the executive's role is portrayed to be in popular culture, he is ultimately a servant of the shareholders and the employees. He acts according to pressure from the owners of the company to transform an existing business into a more profitable business. Morality can and certainly does enter into it, but only in such a capacity where it doesn't interfere too severely with this mission.
When viewed from this angle, it's clear that putting in place laws that would allow you to prosecute CEOs that execute this mission in good faith is foolish. It would be incompatible with our legal principles because it would assume that all leaders of faltering companies are criminals unless proven otherwise, simply by virtue of being at the helm during bad times. Worse, it would transform the role of the CEO from that of the responsibly careful and reasonably bold leader to a timid sheep who lives in fear of mob justice for impossible-to-foresee consequences of his innumerable, seemingly innocent, decisions.