Some psychologists suggest fear is innate; some say it is learned. Whatever. Fear is out there shared by all members of the animal kingdom.
If fear is innate, then, it must be active in our DNA as a safety measure. Now, if fear is innate, then, why in other parts of the world, say, Hyde Park, birds would perch on people's heads, while somewhere else, birds, at the sight of a man, send a danger signal to group members to watch out?
Additionally, fear among animals can reveal a dreadful truth: brutality of human beings. In the said areas, even an eagle way up in the sky does not feel safe let alone stray cats and dogs crossing the garbage-ridden streets of towns. These animals hide in crevices at the sight of a human being. Cats have learned that adults as well as children can inflict pain on then if the cats remain within the kicking range of people.
Furthermore, we may safely assume that as we came into existence, we were given a blank mass storage device to save online some disinformation passed to us particularly by our parents and the society. The content of this decisive disinformation system has various titles: faith, beliefs, convictions etc.
We know that fear of death can be allayed in some religions, while in one or two religions, the first night after death is much frightening. Children of these areas are constantly taught to remember how dreadful the interrogation carried out by two appalling angels sent to the grave is.
Anyway, this conviction can settle so deep that it blocks passage of all reasoning and logic man can master. For instance, a so-called scientist who allegedly studied the up-to-date subject matters in school, when it comes, say, to the movement of Earth, he rejects Copernicus theory because his god forbids this idea. A renowned physician graduated from a modern medicine, after 30 years of practice, mysteriously enough has reverted to obsolete teachings of the so-called omniscient saints who died centuries ago.
To illustrate the case, the following can demonstrate this bizarre behavior:
A sexually impotent patient, having exhausted all conventional treatments, went to the seemingly normal physician and sought advice. Here is his remedy for the patient:
First, go find a jackass that is coupling with a jennet. Fear not! He is so distracted that he may not even see you approaching him. Next, pluck a strand of hair from the jackass's tail. Then, hang a toad from the hair strand and tie the strand to your thigh! After that, go to the woman you intend to have intercourse. The erection you get will be almost everlasting.