It is good that you don't act on fear, in any potentially dangerous situation it is good to look with clarity of mind and at possible outcomes based on the knowledge you have to hand or by trusting your instinct-this is not fear this is wisdom.
fear can immobilize you and can stop you from acting in the wisest way because it makes you cower away from making the best choice and can paralize you making you act irrationally.

Some people count on your fear as a way of controlling you-without they fear they have no power over you.