True, if something is going on that is truly unsafe. But the problem is that I (and I'm guessing many others) automatically go into that fight or flight mode when it really isn't warranted most of the time now purely out of habit of action that we developed under truly dangerous situations that have left us in that state almost permanently because we were traumatized. At some point we have to realize that most of the time what we are so afraid of isn't still happening to us and we have other means of reacting/responding. Personally that is where PTSD had left me -- hypervigilant and reactive -- and I had to get to a place where those reactions were no longer running the show.

This is also about living in a state of fear, not just about immediate fear response. Living paralyzed by our fears is not a survival tool; on the contrary, it deprives us of life.