Yes, it's good to fear an avalanche, or the tiger that wants to eat you. Fear in these cases can mean the difference between life and death. In neither case it is possible to sit down and discuss issues with the thing you fear. When it comes to people, it's not quite as clear cut. The question is not "can fear be valuable?" (obviously, yes, it can), it's "do you prefer to be feared or loved"?
That sounds to me like an oversimplification, but further elaboration would be ... um, read.