There are SO many things to say about what has already been said. To keep from having to quote everyone & make a huge long explanation, I am going to try to keep my reply short & as to the point as possible.
Was the MBTI not made to help people to understand themselves & choose a career path? Do we not all go to work to make money (which in turns allows us to eat, have shelter, clothing or whatever we choose to pay for...)? Check out the list of "preferred" careers for personality types. I believe these preferences are caused by ones' own nature (ie personality preference). So, preferences cause career preference. A person preferring "F" most likely will not want to fire people & etc. If they do, it will be b/c of their ability to see beyond their own values. A "T" person will probably naturally be better at firing, and alot of other managerial type tasks. I agree, however, that the qualities of the feeling function might be an asset to a company, that some may overlook.
The bottom line is, we all have to work. Since there are people out there whom want to sue others and etc, we have corporations (let's face it...who wants to hand out their SSN these days??). These entities are created to MAKE MONEY to pay the people whom work within the system. Everyone has their own talents, and when they are balanced, can use all preferences. If we viewed the company as a whole & not as the individuals, we would realize what is good for the company is good for the people whom work there. The more money it has, the more it has to pay it's employees.
This doesn't mean that everyone will still want to manage others. The ones whom do, will most likely work really hard towards that. That, or they will be competitive, and maybe possibly stab others in the back. Will they get there? I guess it depends on their tenacity & talent (which may not depend on their personality). That, or other factors (which could in some cases be bigotry). Yes, there are some people running companies out there whom are bigoted. To say that all are b/c of the percentage of some research & your own personal experiences, is not strong enough proof.
In some ways, personality typing causes bigotry. I see this all the time on this website. Just b/c someone is an "F" doesn't mean they aren't going to possess those characteristics that we view as "cut throat." I know many "F" preferring people who are willing to manipulate whomever/whatever to get what they want. I know many "T" preferring people who would NEVER manipulate b/c it goes against their standards of operation & they don't see "the point." It really all depends on a persons' mental health & balance. Unfortunately, there are alot of un-balanced people out there.
Last point. Every human being on earth is capable of bigotry. We all experience life & have problems. People learn things from experience. It's our nature. If a person is tortured by someone w/ black hair, they may have flashbacks when they see black hair. It is part of nature, and while we can work on ourselves, we will always be ignorant to many things.
(Did I mention I am an INTP drudgingly working in the accounting/bookkeeping/payroll/tax arena for almost 10 years?? Fucking sucks.)