People are quick to label something as “fear” — but people also confuse caution and fear — which can be two very different things.
Words can be very subtle — and often the subtleties cause issues when put together with our hasty ideas.
For example, You may doubt something (or someone) because you have facts that add up to something not working out. You may be cautious because of similar situations that don’t pan out. There are any number of actual reasons for caution — which makes it not a fear-based reaction but a rational train of thought that simply doesn’t lead to a good end.
So yes, fear can be dangerous if it paralyzes us for no reason — but when there’s a reason, it may be more a healthy dose of caution than anything else.