What about you can't reinforce fear did you not get? Let me ask you a question. Let's say you're afraid of spiders. Every time you see a spider someone threw a hundred dollar bill at you. Chances are you're going to feel better about seeing spiders because getting 100 bucks alters your mood rather freaking quickly.
There's a whole system of training by Bart Bellon called nepopo where unpleasant feelings signal reward. Kind of disproves his theory.