Life and death in this world are encapsulated by race, religion, money and power. Power being the most important of all.
It is he who holds the power controls the other three,subsequently having control over the life and death.
The ones with the most power are regarded as people with a higher status than others. Similarly, people with more money are considered as people with a higher status than others and one race over the other ..vice versa religion.
Inequality is rooted in the world. The natural order in this world thrives on the inequality of the creatures living in this world. Humans being most sophisticated of all the creatures adopted this secret to keep the world from delving in to chaos.