Fears are a chemical feedback in your body from a stimulus. It makes you feel and react a certain way. The way you react to this sensation in your body is up to you and can be trained.
Fear was designed for a flight or fight response. Fear has kept the human race alive for many generations and will continue to do so.
The first response by nearly the whole world was to retract and hide from the corona-virus. This initial reaction was not based on facts but on fear.
Fear can be a good thing once its learned and accepted. It can cause us to do great things.