Ehh, I don't think that disgust works that way -- not the disgust that the brain scientists are talking about. That's a front-brain pity, not disgust. Disgust is a visceral, hind-brain thing. Your conscious mind is barely consulted about it -- it happens in the mostly autonomic section. It's not something people have much control over. You can do your tasks in spite of your disgust reaction, but you still have the reaction. FWIW, you can reliably tell whether someone has conservative or leftist politics by showing someone disgusting pictures (shit, open lesions, dead animals, etc) on an fMRI. Conservatives' brains light up brightly in the disgust area, and leftists' brains hardly react at all. Liberals really are broken, incomplete people in that they don't experience the full range of emotions and human reactions.