I can't make up my mind on this one. I don't know whether your worst fear is made worse by encountering it, and only made better if, in that encounter, you subdue it. If you face your worst fear and it subdues you, then I think the process of facing your fear does more harm than good because it reinforces a negative message (shit, I'm really scared, this is too much and too real,) as a pose to a positive one (I can do this, there's nothing to be frightened of.)
Psychologists talk about facing your fears to (hopefully) put mind over matter, and effectively dissolve them. But I think "fear" is a more complex phenomenon than this - surely it takes deeper work to identify the "why" of your fear as a pose to simply placing you in front of the scenario or object - whatever - which may just be a conduit for expression after all.
What are people's thoughts/experiences on this?