A wide range of brain regions contributed to the prediction of political ideology (Figure 3A), including those known from past work to be involved in the processing and interoception of disgust and other stimuli with negative affective valence, but also those involved in more basic aspects of attentive sensory processing: we found regions known to be involved in disgust recognition [17, 36, 37, 38] (e.g., insula, basal ganglia, and amygdala), perception of bodily signals  (e.g., insula), the experience of physical/social pain  or observing others in pain  (e.g., S2, insula, PAG, and thalamus), and emotion regulation  (e.g., DLPFC, insula, amygdala, and pre-SMA), along with regions involved in information integration  (e.g., thalamus and amygdala), attention [43, 44] (e.g., amygdala, IPL, FFG, STG/MTG), memory retrieval [44, 45] (e.g., hippocampus, amygdala, and IPL), and also inhibitory control  (e.g., IFG, DLPFC, and pre-SMA), perhaps to suppress innate responses. Although our results suggest that disgusting pictures evoke very different emotional processing in conservatives and liberals, it will take a range of targeted studies in the future to tease apart the separate contribution of each brain circuit.Translated from the jargon, what that means is that there is solid scientific grounds for believing that leftists are too stupid to understand potential threats and too filthy to be repulsed by disgusting things.
We proposed that conservatives, compared to liberals, have greater negativity bias , which includes both disgusting and threatening conditions in our study. Our finding that only disgusting pictures, especially in the animal-reminder category, differentiate conservatives from liberals might be indicative of a primacy for disgust in the pantheon of human aversions, but it is also possible that this result is due to the fact that, compared to threat, disgust is much easier to evoke with visual images on a computer screen.
Which one hardly needs any scientific evidence to correctly conclude as simple observation of the behavior of most left-liberals is sufficient to prove the case beyond any shadow of a reasonable doubt.
I had previously recommended that Lena Dunham be harpooned and processed for oil, but now I think that she may have some additional utility to science before her Innsmouth genes come to the fore and she shambles off to join the shoggoths deep under the sea. It seems to me that we could measure units of disgust in terms of a Dunham scale, similar to the Kelvin scale, with the null point absolute zero indicating a perfect Dunhamian left-liberal who is completely inert and incapable of being disgusted by anything except someone failing to toe the politically correct line du jour.