We are responsible to ourselves for our own existence; consequently we want to be the true helmsman of this existence and refuse to allow our existence to resemble a mindless act of chance.
You can't accomplish anything worthwhile if you inhibit yourself. If life teaches you nothing else, know this for sure: When you get the chance, go for it.
I think in the case of horror, it's a chance to confront a lot of your worse fears and those fears usually have to do, ironically, with powerlessness and isolation.