As children we were afraid of the dark and the monsters we knew were fake that roamed free in it's cover
As adults we are afraid of things we do not know, we do not understand, what we do not see; these are the things we learn to hate, the monsters that plague our nightmares
Now tell me if you see the similarities in behaviour? The only difference now is that when grown, a person begins to think that these beasts they fear are real, and will find every evidence to prove it.
