Performance metaphors often entail anger. Frustration, failing to meet a goal, is a universal trigger for anger. And anger, righteously focused, can often be put to good use. By contrast, purity metaphors trigger disgust. When directed at the self this produces self-loathing, shame, and guilt. These emotions are much more difficult to get moving in a positive direction, mainly because they prompt social concealment that thwarts transparency and confession.
