My assumption that they are is based on the fact that by comparison with European and Asian CEOs, they are paid significantly more, for performing what are presumably the same functions.
I would guess that at least part of the problem is that the boards of these companies makes these decisions, playing with other people’s money, and also because a large portion of their compensation is in the form of stock options, which are effectively the same as a tax on the shares of current shareholders (since their value becomes diluted) but which are not nearly as blatant as direct payouts.
But I also think a big portion of it is that people in America, including but not limited to members of the boards of directors of corporations, have a tendency to focus on the actions of a few key players at the expense of the unseen masses, and to attribute the success or failure of massive enterprises to these few individuals.
When considering history, there are competing schools of thought - one school is the Great Man school of history, which looks at historical events as being the work of a relative few outstanding individuals who shaped the course of history by their outsize impact. The other school (I’m not sure of the name, if it has one) tends to look at historical events as being shaped by millions of individual factors, forces, and people, which combine to produce the circumstances in which a few more outstanding individuals are thrust into pivotal roles. ISTM that the cultural attitudes in the US are very much in the first camp.
This manifests itself in many ways. You have many pop-culture (movies, books etc.) depictions of great events boiling down to the impact of one hero, a tendency to view key politicians (presidents, governors) as being fully responsible for the success or failure in matters over which they have relatively little impact, a tendency to attribute all the problems in foreign countries to the specific tyrant that heads it (Duvalier, Marcos, Hussein et al), even the inordinate focus on the person of Osama bin Ladin, and so on.
And so it is with corporations. There are many factors that determine the success and failure of corporations, and the specific guy running the company is one small part of it. General economic conditions, legal changes, currency fluctuations, technological developments, commodity prices and other factors have a huge impact on the corporation, but there’s little a CEO can do about them. (And even when the CEO has an impact, it’s by having other people do the actual work. If a CEO manages to get his employees to work harder and more productively, the success of the company is based on the hard work and productivity of the employees much more than the encouragement of the CEO.) But yet, you frequently see people attributing the entire success of the company to the CEO and justifying his compensation on these grounds (“so-and-so raised the stock price/profit for his company by $2 billion, so the $400 million that he was paid is well worth it”).
(Along the same lines, a far too great emphasis is placed on managers and head coaches of sports teams IMHO, and they are given far too much credit when their teams do well, and far too much blame when they don’t.)
For this reason, I think some of the proposed solutions to the problem miss the point (or at least this part of it). Many of the solutions involve giving shareholders greater influence over pay decisions, but the shareholders, who presumably hold largely the same attitudes as everyone else, are also apt to attribute too much of the company’s performance to senior leadership, and thus over-reward good performance and under-reward bad performance. Similarly, proposals to tie CEO pay more closely to company performance miss the mark for the same reasons.
If the most brilliant CEO took over control of one of the US automakers, they are not going to be able to turn things around anytime soon, because they face structural problems that are beyond the ability of a CEO to eliminate, no matter how well he functions, and if you give the dumbest fool the top job at Home Depot, he will “produce” dramatic results once the economy turns around and homebuilding picks up again.
So what is the answer? I have no idea.