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If we couldn't be afraid we wouldn't survive for long. We would be walking into oncoming traffic, stepping off of rooftops and carelessly handling poisonous snakes. We would be hanging out with people who have tuberculosis. In humans and in all animals, the purpose of fear is to promote survival. In the course of human evolution, the people who feared the right things survived to pass on their genes. In passing on their genes the trait of fear and the response to it were selected as beneficial to the race. Fear acts as a guide for us to know and stay away from dangerousness situations thus saving your life and increasing your chance of survival.
One of the major themes in the novel Divergent by Veronica