You are all descended from people who avoided getting killed before they had children.This is kind of obvious but it is the basis of the theory of evolution.
Since humans a social animals and don't tend to survive to well on there own most people a also members of societies survive with out being destroyed.
A MIND GAME
Imagine two groups of people.One group is always fighting and killing each other.The other group is more co-operative and works together to build things, harvest crops and so on.
You can see that the group that is always fighting won't be able to build anything much more complex than one person can do on there own. No great irrigation schemes no granaries,no schools. In any kind of natural disaster like a famine or earthquake they will be less likely to survive than the group who cooperates.
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