"We can easily forgive a child who is afraid of the dark, the real tragedy is when men are afraid of the light." (Plato)
A child not yet invested with his full compliment of rational capacities can be easily frighten, especially in the dark. In the dark, where our out stretched hand cannot be seen, our imagination is inspired with limitless possibilities. As I remember, my first frightful experience was in a dark movie theater, watching "the Wizard of Oz," when the "Wicked Witch of the West" suddenly pop on the screen, with her green face, large crooked nose, and her menacing laugh. I bet most adults can relate.
The idea of human beings tragically being afraid of the light, can be explained by a consideration of their spiritual side. The light side represents a chosen path leading to liberation and unification with the Source. The dark side, is where 90% of the time we live and have our ego identity, as Darth Vader said to Luke, there is great, ..."power in the dark side." The reason we have blinders on in relationship to the light side is because we know , deep in our soul, that in order to follow the light path we must renounce our dark identity; its pleasures and its pain. We in truth, are not ready to renounce our familiar dark side because of our ignorance and fear of the light side.