Perplexed comments on Separate morality from free will - Less Wrong
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It certainly does. It helps to inform you who can be trusted as a coalition partner.
Furthermore, if your feeling of disgust results in your being less nice toward the disgusting party, then your righteousness tends to deter disgusting behavior - at least when you are there to express disapproval. That is a signaling function, to be sure, but it is signalling directed at the target of your disgust, not at third parties.
Also, if I feel disgust in situations that historically correlate with becoming ill -- for example, eating rotten food -- I'm less likely to become ill. We can be disgusted by things besides other primates, after all.