People want to overcome their fears, is that really wise?

I believe there are some fears that you should try to overcome, but others that you shouldnt. For instance: If youre afraid of spiders, I believe you should educate yourself about which spiders are dangerous and which arent, and to only be afraid of the ones that ARE dangerous. That way youre not running around afraid of ever single spider that crosses your path, but you wont get bit by one that is poisonous because you had no fear and picked it up. Some fear is necessary for survival, others arent.