Fear can be healthy. It is programmed into your nervous system, and gives you the survival instincts you need to keep yourself safe from danger.
Fear is unhealthy when it makes you more cautious than you really need to be to stay safe, and when it prevents you from doing things you would otherwise enjoy.
from betterhealth.vic.gov.au
Fear is a natural and biological condition that we all experience,” says Dr. Sikora. “It’s important that we experience fear because it keeps us safe.”
Fear is a complex human emotion that can be positive and healthy, but it can also have negative consequences.
from nm.org
*I'm not sure if I answered you completely though
you can always prove your arguments by saying the site that it was proven
