Does everyone react the same way in the same situation? Of course not. The clearest and least controversial example of this is with children. Most parents know that each child has a different personality from the very beginning, before he or she is "taught" to act one way or another. Any two children will react differently, for example, if a lollipop is taken away from them. One may cry longer; another may be more passive or even apathetic. It seems that everyone has a somewhat different temperament when reacting to the same situation. Some people are quick to anger, and others are more easygoing
What parents may not know, however, is the reason for personality differences in society. They occur when small differentials in daily reactions, motivations and dispositions across people add up to drastically different temperaments over time. People have different skin color, body size, hair color, and so on. No doubt people are allocated different inner eyes as well.
Our dispositions, on a daily basis, determine who we are and who we can become. Some people's inner eye allows them to delay gratification in hope of future reward, a trait highly linked to future success. This is not something that can be learned. Some people are quick to be incited to violence, whereas other people cannot easily be goaded. This threshold is genetically determined. Some people are always somewhat uneasy, searching for answers. This sense of unease is genetic as well.
People with certain traits have a greater natural ability to study hard and work toward advanced degrees than those who are not so motivated on a daily basis. They can earn more money, afford better health care, and generally live a better life, because they are more fit in the modern information society.
Certainly there are people who find their greatest joy, say, in standing poised with a spear over a rabbit hole for hours at a time, waiting for a potential dinner to emerge. But people with such dispositions will never again be required in modern society, in which increasing productivity makes their dispositions redundant. Is this fair?