Every leader of Israel is considered to be a king. The Torah wanted to compare and contrast the kings of Edom with the kings of Israel. Each one of the Edomite kings rose to power through military power, prowess and conquest. Furthermore, none of these Edomite rulers were themselves descendents of Esau. Meheitaval's father was called by this name because the abundance of gold flowed from him as if it was water.
Human beings are extremely adaptable.
We can survive and flourish in almost any situation. Part of what enables us to do so is our ability to desensitize ourselves to our reality. In some cases that can be quite helpful. But in other cases it can have a negative effect. If one is so wealthy that a person is desensitized to the value of money, one might not understand the suffering of those less fortunate.