Fear is not a natural response to a stimulus. It is a learned response. It is the ability to recognize danger and then choose to flee from it or confront it.
We feel fear when the world has taught us that something is dangerous. That something is painful. That something should be avoided if possible.
It takes a long time to deprogram a fear, longer if that fear is deep-seated. So to suggest that a fear is something that someone should “get over” disregards the significant effort necessary.